1993 Chevy K1500 Cheyene - 5.7l/350 TBI - 5spd manual - 4wd
Yesterday morning about a couple blocks from work, when taking off from a stop my truck suddenly started bucking. Let off the throttle and started running normally again. Gave the slightest amount of throttle and it would get going but any more than a hair of input from the accelerator pedal resulted in the bucking coming back.
This was at 4AM - noticed when the engine would cut out that all the lights on the truck would go out at the same time. Also noticed that as I was accelerating - without bucking - that the gauge cluster and stereo lighting would flicker and my gauges would randomly die/fluctuate.
I was able to get it the 20 miles home going down backroads. I found a good pedal position to keep the truck from bucking and still accelerate - painfully slow, but could get through the gears. Only took it up to about 40-45MPH though.
Being daytime I didn't have my lights on and I noticed that when accelerating the lights would now flicker slightly ON and when the truck would buck They would strobe on/off. Also the gauges would dance all over the place almost the whole time I was driving - settling down and going to the "correct" position a few seconds at a time before going back to dancing around again.
As I mentioned earlier - I could slowly get the truck up to 40-45MPH (didn't try any faster) and cruise just fine. If I was going a steady pace down the road - no matter what speed the truck ran great as long as I didn't need to accelerate. At idle - the truck would idle fine - never miss - things would start flickering if I stepped on the brake pedal or put it in reverse.
Thought it seemed like a grounding issue... Looked up ground locations and checked - they were all there outside of one strap that runs from the back of the head to the firewall. It had rubbed through/broken from getting caught between the firewall and headers the PO had put on. I got that one fixed - soldered a connector and a wire going straight to the battery. I also detached and brushed the connectors and grounding points for all the grounds.
Took the truck out again and still did the same things...
I should also mention that Since I got the truck (about a month ago) when I turn on the headlights the blinkers come on and stay lit and do not work. When the headlights are off the blinkers "work" but both always flash when I use the indicator. Not sure if it's related at all but thought it was worth a mention. I was planning to go through the headlight switch/wiring soon - ordered a new switch a week ago and should be here any day now.
Yesterday morning about a couple blocks from work, when taking off from a stop my truck suddenly started bucking. Let off the throttle and started running normally again. Gave the slightest amount of throttle and it would get going but any more than a hair of input from the accelerator pedal resulted in the bucking coming back.
This was at 4AM - noticed when the engine would cut out that all the lights on the truck would go out at the same time. Also noticed that as I was accelerating - without bucking - that the gauge cluster and stereo lighting would flicker and my gauges would randomly die/fluctuate.
I was able to get it the 20 miles home going down backroads. I found a good pedal position to keep the truck from bucking and still accelerate - painfully slow, but could get through the gears. Only took it up to about 40-45MPH though.
Being daytime I didn't have my lights on and I noticed that when accelerating the lights would now flicker slightly ON and when the truck would buck They would strobe on/off. Also the gauges would dance all over the place almost the whole time I was driving - settling down and going to the "correct" position a few seconds at a time before going back to dancing around again.
As I mentioned earlier - I could slowly get the truck up to 40-45MPH (didn't try any faster) and cruise just fine. If I was going a steady pace down the road - no matter what speed the truck ran great as long as I didn't need to accelerate. At idle - the truck would idle fine - never miss - things would start flickering if I stepped on the brake pedal or put it in reverse.
Thought it seemed like a grounding issue... Looked up ground locations and checked - they were all there outside of one strap that runs from the back of the head to the firewall. It had rubbed through/broken from getting caught between the firewall and headers the PO had put on. I got that one fixed - soldered a connector and a wire going straight to the battery. I also detached and brushed the connectors and grounding points for all the grounds.
Took the truck out again and still did the same things...
I should also mention that Since I got the truck (about a month ago) when I turn on the headlights the blinkers come on and stay lit and do not work. When the headlights are off the blinkers "work" but both always flash when I use the indicator. Not sure if it's related at all but thought it was worth a mention. I was planning to go through the headlight switch/wiring soon - ordered a new switch a week ago and should be here any day now.