TheKOOK
Newbie
I have a 1988 k2500 tbi that has been giving me some grief lately. The truck starts and idles very well and drives like normal for a few miles then starts acting up. For example the other day I drove the truck to work which is about seven miles from my house. The started fine in the morning and I drove it to work with no issues. however when driving back home from work about half a mile from my house the truck falls flat on its face, no power and when i go to accelerate it starts popping like its back firing im only able to go about 20-30 mph max and i noticed right when i lost power the SES light came on. so when I got home I checked for codes and I'm getting a code 44 and code 51. I know code 44 is a lean code and code 51 is PROM/MEM-CEL error. I had code 51 when I first bought the truck back in April of this year so I replaced the ecm and prom with another one out of the same exact truck as mine, I made sure the numbers on the ecms matched. The part that is stumping me is if I pull over and turn off the key when this issue happens and then immediately start the truck back up the light goes away and the truck runs normal until several miles then it happens again. Also Id like to point out this issues seems to only happen when im going uphill and accelerating but not every time I accelerate up a hill, its a very intermittent issue.