Having issue with my 91 gmc sierra

[spiderjones]

Hey i have a issue with my 1991 gmc sierra 4x4 5.7 liter when im giving it full throttle it hessitates loses power stalls you name it with me having the pedal to the floor i checked the fuel perssure and read 12 psi i changed the filter checked the fuel injets i changed the throttle position sensor the oxygen sensor the map sensor can anybody help me

 

[Billr]

I had a similar issue with my 1991 GMC Sierra. Turned out to be a clogged fuel filter. I was thinking the worst and for 45.00 it was running like a top. Hope this helps.

 

[Phatocaster]

Replace the fuel filter first. If that doesn't do it then check the accelerator pedal. Some have a sensor on the accelerator pedal that causes issues. Your's may not have it.