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Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 16769
Experience:  15 years GM master tech
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Chevrolet Silverado 1500: I have an intermittent miss on a

Customer Question

I have an intermittent miss on a 1997 Chevy 5.7 sometimes it runs like new from startup and other times it barely stays running until it's been driven for a while
Submitted: 2 years ago.
Category: Chevy
Expert:  Gary replied 2 years ago.
I am sorry your having this problem
Expert:  Gary replied 2 years ago.
are there any codes being set in the computer current or history ?
Customer: replied 2 years ago.
Expert:  Gary replied 2 years ago.
Thank you for that informationmost of these type of issues with NO codes set are usually caused by one of 4 things1 ) a restricted or plugged fuel filter or low fuel pressure if the fuel filter is new or newer then make sure the fuel pressure is reading 60 - 66 PSI key ON engine off and make sure the pressure will hold within spec for a few seconds.if the pressure is below spec or drops way below spec or even to 0 withing a few seconds then the fuel pump is weak and allowing fuel pressure to ran back through it with a bad one way check valve built into the pump 2 ) dirty fuel injectors will cause this issue and usually a good fuel injector pressure cleaning with a fuel injector pressure cleaner will clean them out good 3 ) very rare but we have had a few with crank sensors causing this kind of issue but usually will set a code 4 ) a dirty MAF which usually you can remove the MAF and clean it out good with carb cleaner or MAF spray cleanerin a nut shell 99 % of these type of issues are fuel related with no codes set