Donaven361
Newbie
I have a 97' Chevy 2500HD 5.7 L31. The truck runs fine at idle and under low load around town. No misfires, and starts right up. Only thing is when you actually press on the gas > ~30% throttle the engine puts out no power, and jerks around like it's stalling out or misfiring. Whens it finally stops jumping out of its mounts it starts increasing speed very very slowly. There is no CEL or codes in the history at this point.
Here's all I've replaced and tested.
- new air filter
- cleaned MAF
- new fuel pressure regulator
- cleaned/inspected injectors
- new fuel filter
- new fuel pump
- new distributor, cap and rotor, wires, and plugs, gapped at .060.
- new EGR valve
- new PCV valve
- new ECT sensor
- new TPS
- compression test satisfactory, highest 207psig lowest 195psig
- fuel pressure within specs
- no vacuum leaks
- everything is good on diagnostics computer fuel trim, MAF, etc. (OBD2)
No idea what it could be. Anyone got any ideas ?
Here's all I've replaced and tested.
- new air filter
- cleaned MAF
- new fuel pressure regulator
- cleaned/inspected injectors
- new fuel filter
- new fuel pump
- new distributor, cap and rotor, wires, and plugs, gapped at .060.
- new EGR valve
- new PCV valve
- new ECT sensor
- new TPS
- compression test satisfactory, highest 207psig lowest 195psig
- fuel pressure within specs
- no vacuum leaks
- everything is good on diagnostics computer fuel trim, MAF, etc. (OBD2)
No idea what it could be. Anyone got any ideas ?