Patty Leonard

I didn't know either, I just found out 3 weeks ago about the AFM issues,after researching my cylinder 4 misfire, if I knew about it,I would of had it deleted from the ECU

Hi I have a 2008 Chevy Avalanche 5.3L gas. Only 120,000 miles on it. Flickering lights, check engine light, traction control off, service stabilitrak,Misfire cylinder #4, I replaced all plugs,wires,and swapped a couple of coil packs around, pulled injectors 2 and 4 out hook the injector up to a 9-volt battery, so I can open and close the injector while spraying the carburetor cleaner through a tube I made, I put injector 2 in the spot 4 injector, and I put injector 4 in the spot where injector 2 was ,new alternator,map sensor, and throttle position sensor, also did a compression test that was good, still misfire cylinder 4. So I decided to remove the valve cover, all rockers are solid, no movement at all, so I did a crank test first,and all the lifter's moved, next I started the engine,and all lifters moved, within 5 seconds, lifter #4 exhaust side stopped moving. I have no ticking sound from the engine at all, could this be the VLOM solenoid? Or possibly the ECU, the ECU is what commands the solenoids to open and close from V4 to V8. I had a friend come over with his professional scanner, and the scanner showed misfire cylinder #4, brake control modular, and something with the ECU.