car is misfiring and the mechanic cant figure out what the problem is?

[sergeA4]

couple days ago after replacing the cam adjuster seal (half moon) i got a CEL for a lean mixture. So i went to mechanic, turns out it was the hose that goes from the turbo to intercooler which had a hole. So i replaced that, came home and noticed the car started to studder slightly, so i took it for a boot and when i came to park, it was misfiring like crazy and CEL was blinking. So back to the mechanic and we did a lot of stuff to check and we cant figure out whats wrong with it. Here is what i checked let me know if i missed anything.

-Checked for coilpacks and plugs
-Checked for vaccuum leaks or other leaks(smoke machine)
-checked the timing, front and back(since i replaced the seal i thought when he put the chain back the timing was messed, but wasnt)
-the pressure is good in all cylinders cause we tested it
i doubt its the cat since i replaced it under warranty from audi earlier this year

let me know if there is something else i should try, im about to explode.........thanks

[bez101]

i see u checked them but id go for coils

did you scan for codes it should have stored something with the blinking cel

[Sales@RAI]

Did you run the codes? Is it isolated to one cylinder?

[sergeA4]

i cant remember my mechanic was doing it but it was throwing misfiring codes, i dont know any more. But we did replace all 4 coilpacks and it still ran the same

[bez101]

well the chain could be a link out
i was a tooth out on the belt and it chucked missfires all cylinders

[IVRINGS]

How about you check your spark plugs? I popped a coil in my wifes Jetta just this week and ended up needing to replace the spark plug and coils cause it fauled out since I limped it home. Also I would get a new mechanic period.

[sergeA4]

well the chain could be a link out
i was a tooth out on the belt and it chucked missfires all cylinders

he checked the chain and it looks correct

[sergeA4]

How about you check your spark plugs? I popped a coil in my wifes Jetta just this week and ended up needing to replace the spark plug and coils cause it fauled out since I limped it home. Also I would get a new mechanic period.

that was done. He put all 4 new coilpacks and spark plugs and it ran the same, theres nothing wrong with the mechanic

[bez101]

looking correct and been correct did he use the cam tool to check did he count the links ?
but if he cant figure it out id get a new mechanic

[B6Lovin]

check the coil ground on the valve cover and make sure it's tight

[Elliott]

check the coil ground on the valve cover and make sure it's tight

Good call.