HELP!!! 5.7 ISSUES

[Jcolburn71]

I’m new to trying to build something so there will be more stupid questions to come.

The truck hesitates on takeoff and at around 10-15th while cruising(unless you’re in 2nd gear then it drives fine). Any suggestions on which route to go to fix this issue ? Tune up ? Fuel Filter ?

New Parts that I have replaced trying to chase the ghost:
Fuel Filter
Injectors
Spark plugs
Wires
Rotary button
Cap
New MAP sensor
New TPS sensor

 

[Jcolburn71]

10-15mph not th.

 

[name]

What year truck , how many miles are we talking about ?

I would doubt it is a fuel filter and with the parts you listed as new, I would check for a vaccume leak and make sure the base timing is correct.

 

[Schurkey]

I’m new to trying to build something

How much of this vehicle has been "built" (modified)?

The truck hesitates on takeoff and at around 10-15th while cruising(unless you’re in 2nd gear then it drives fine). Any suggestions on which route to go to fix this issue ?

The Usual Three:

1. Verify fuel pressure at prime, at idle, and under load. Most fuel pressure gauge assemblies have a push-button pressure release connected to crappy vinyl tubing. Route the tubing so it empties into a drain pan, then push the button while the engine is running. This simulates higher fuel demand if you can't check fuel pressure on the highway. Fuel pressure should remain steady even with fuel flowing down the pressure-relief tubing. How old is the fuel filter? Have you ever dumped a bottle of Chevron Techron Complete Fuel System Cleaner into the gas tank? (Recommended at every oil change.)
   
2. How old are the usual “tune-up” parts and procedures? Inspect/replace distributor cap, rotor, plug wires, spark plugs. Make sure the ignition coil will reliably fire a spark-tester calibrated for HEI when the coil is fully warm, and misted with water from a squirt-bottle. Cranking compression test of all cylinders while the spark plugs are removed. Verify EGR, PCV, EVAP, and Heated Air Intake (if used) systems for proper operation. Verify proper initial timing (TBI) and electronic spark advance (TBI and Vortec). Replace old O2 sensors unless you can PROVE that they're working properly—old O2 sensors get lazy, they don't provide accurate data, but they do provide “data” that fools people into thinking they're “working”.
   
3. Connect a scan tool (NOT a crappy “code reader”) and look for “codes”. More important, look at the data stream to verify EVERY sensor and computer output. Verify fuel trims during the time that the vehicle is not running properly. Look for misfire counts for each cylinder (OBD2 only.) “Codes” have official diagnostic procedures that will be found in the service manual set for your vehicle. The service manual set can be downloaded from the links in the Sticky thread section of the Engine forum on this web site.

What year truck , how many miles are we talking about ?

Yup. What vehicle is this? Be specific.