2008 Chevrolet Silverado flex fuel po300 help
 

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
https://cimg6.ibsrv.net/gimg/chevrol...7934f80ea.jpeg

https://www.motor.com/wp-content/uploads/Trouble-Shooter-Nov-2012.pdf

Hope that helps.

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?