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Ask Mike S. Your Own Question
Mike S.
Mike S., ASE Certified Technician
Category: GMC
Satisfied Customers: 6777
Experience:  GMC N.A.I.S.E. Certified Auto-Mechanic
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1991 c3500 7.4 hesitates when u hit gas then pops then

Customer Question

1991 c3500 7.4 hesitates when u hit gas then pops then accelerates,when at temp have to baby it ,if u try pulling somethi g its like you are pulling a mountain,poppi g noaccelerTion almost dyi g if u touch pedal,but idles perfect,tps tuneup done
JA: Where exactly do you think the noise is coming from? And how long has this been going on?
Customer: No noise bad a celefation no power
JA: What is the model of your '91 GMC?
Customer: C3500 7.4
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Tuneup,tps fuel filter,ect
JA: Anything else you think the mechanic should know?
Customer: Àhen tryi g /o haul anythi g it causes truck to run hot and popping if u touch padal
Submitted: 3 months ago.
Category: GMC
Expert:  Mike S. replied 3 months ago.

You may have a faulty map sensor, retrieve the trouble codes, Try a new fuel filter and if that don't help check the fuel pressure.

Expert:  Mike S. replied 3 months ago.

Do you still need help with this?