No horsepower

Asked by Oct 08, 2016 at 11:26 AM about the 2001 GMC Sierra 1500 SL Extended Cab LB

Question type: Maintenance & Repair

01 GMC Sierra 4.8 Vortec V8 starts up but runs like
shit. Had new heads put on idles rough when you
put it in gear and drive it it has no horsepower
takes forever to shift gears

3 Answers

01 GMC Sierra 4.8 Vortec V8 starts up but runs like shit. Had new heads put on idles rough when you put it in gear and drive it it has no horsepower takes forever to shift gears

5,045

Check for check engine codes? Check basics, air filter, vacuum leaks, fuel pressure and fuel filter. If everything checks out good, may have a plugged catalytic converter

No catalytic converters on the truck check engine light on but I can't pull anything off putting the air filter is good I will check for vacuum leaks fuel pressure in fuel filters get back to you

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