I have a 2001 gmc yukon 5.3l 4wd P0307 help me..

Question

I have a 2001 gmc yukon 5.3l 4wd im haveing a code come on P0307 changed the spark plugs to iridium and tested coils with a coil tester and all seems good maf is good no air leaks cleaned the tb when i first start the truck it hesitates and has a small jumpy feeling in the engine and a bit of stalling there has been times where it just turns off at idle havent checked the injectors yet but anyone who has had similiar problems with this please help.. P0307

Answer 1

P0307 Misfire number 7 cylinder.

You may have to swap that coil and the sparkplug wire to a different cylinder and retest, Also be aware that when it comes to Chevy they are known to not be able to correctly identify the cylinder that is misfiring. This happens when a CKP (Crankshaft position ) sensor is replaced and a CKP relearn is never perfromed.