lakoe

?

im not too sure, i didnt mess with any of the cam or crank sensors, and only messed with the maf sensor by removing and reinstalling the intake pipe

So to start, i have a 2008 S5 with the CAUA 4.2 V8. It has 100k miles and about a month and a 1/2 ago it began getting misfires in cylinders 1 2 and 4, so i went about diagnosing, plugs, coils, etc.. wasn't them so i moved to injectors, pulled off manifold, both fuel rails and replaced the 3 injectors on the problem cylinders, replaced all 8 o rings along with the intake manifold gaskets, and now im still having the same problems. Some back story - Cold starts have gotten noticeably quieter, much slower, sluggish, sounds muffled almost, feels like its running on half the cylinders. If I get the car above 4k rpm a flashing engine light comes on for a few revolutions and then goes back to steady engine light. ive attached my VCDS scan below. Log-WAURV78T88A045948-165430km-102793mi.txt

So to start, i have a 2008 Audi s5 with the CAUA 4.2 v8. It has 100k miles and about a month and a 1/2 ago it began getting misfires in cylinders 1 2 and 4, so i went about diagnosing and checking the plugs and coil packs and it wasnt them so i moved to injectors recently and took apart the intake manifold, pulled both fuel rails and replaced the 3 injectors on 1 2 and 4, did a carbon clean and replaced the left sides o rings but not the right injectors o rings. i also didnt replace the teflon seal or the intake manifold gaskets when putting it back together, so i finally get it all together and the misfires on 1 2 and 4 are gone but now its cylinder 5 along with a lean code (whats different from when i bought the car - cold starts are a lot quieter, doesnt scream like it used to, much slower, almost sounds muffled when its straight piped, feels like its running on 5 cylinders not 8 and lastly when i do a pull above 4k rpm, a flashing engine light comes on for 5 seconds and then goes back to a static engine light) only ideas i have is to take the whole manifold off once again and replace the other side of fuel injectors o rings, and replace the two intake gaskets. TLDR - 3 misfires, replaced injectors now all 3 misfires gone but new one on different cylinder and lean code. drives the same before fixing.