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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15181
Experience:  GM Grand Master Technician 2007. 14 years experience.
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I have a 5.3 chevy Silverado and it bucks leaving the

Customer Question

I have a 5.3 chevy Silverado and it bucks leaving the driveway and when I press on the fuel it will back fire and start to ping right crazy but if throttle slowely it will gain speed without pining or back fireing
JA: Has the vehicle turned into a gas hog? And how does it start -- same as usual?
Customer: gas good starting perfect a little rough when vechial warms up
JA: What year is your Silverado?
Customer: 2002
JA: Are you fixing your Silverado yourself? What have you tried so far?
Customer: checked fuel pump changed filter changed crank sensor changed temperature sensor and throttle sensor plugs plug wires and switch coils starting with two new ones and changing up coils to the last one on unit
JA: Anything else you want the mechanic to know before I connect you?
Customer: had the two monifolds changed with after markets ones because they were leaking that's when this started to happen just manifoles
Submitted: 6 months ago.
Category: Chevy
Expert:  Gary replied 6 months ago.

what is the fuel pressure reading key ON engine OFF ?

are there any codes set ?

what exactly was changed then this happened ?

Customer: replied 6 months ago.
58 lbs the code was mlssfire the manifolds plugs wires and plugs temp sensor throttle sensor crank sensor
Expert:  Gary replied 6 months ago.

what part did you change to where now you have this problem ?

which manifolds where changed and then right after that you have this problem ?

the cat converters ? the exhaust manifolds ?

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