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2008 5.3 flex fuel Chevrolet Silverado po300 hooked up to computer misses only when idling it misses on 1-4-6-7 but once I drive it stops missing and check engine light goes away I’ve put a fuel pressure regulator,fuel pump,spark plugs,maf sensor and nothing has helped I also done a fuel pressure test and it’s reading kinda high around 80-90 psi with truck running if you have any idea what it could be please let me know thanks
Those cylindrs are the afm cylinders. At idle lower oil pressure causing lifters to not function properly, misfire. At road speed, higher oil pressure operate normally?
2008 Chevrolet Silverado flex fuel po300 help
