Help me troubleshoot dad's B6 1.8t

[MrMThree]

Ok so all of a sudden dad's car just would not hold idle.
had a random misfire code, and a misfire code for each of 4 cylinders as well as a lean condition code.
While doing a tune up on the car (plugs, air cabin fuel filters, oil) i replaced a broken check valve which took care of the vac leak. i thought thats why the car wouldnt hold idle, i was wrong.

so, here's what i have so far
-the car gets fuel, the plugs are covered in gas.

-car doesnt hold idle at all. have to keep revs over 2k. while doing so theres a loud pop from the back of the motor every 4 or 5 secs. like a backfire (knock sensors have anything to do here)

-since replacing the check valve i'm half a can of starter fluid into searching for other vac leaks and theres nothing.

-oil looks and smells fine on cap and dipstick

-coolant take/cooling sys was pressurized. after 3 or 4 days sitting i took the cap off and coolant burst out
no sign of oil in the coolant

-i'm going crazy

-sections of hair missing on my head from me pulling it out.

where do we go from here? coil packs? it just all of a sudden crapped the bed, it makes little sense we'd lose all 4 coil packs instantly at once.

anybody?
not much of a diag. tech, esp not with audis!

TIA,
Mike

[beemercer]

coilpacks are a good bet, do you have the ability to scan codes? If its misfiring and you move the coilpack and the misfire moves with it, then there's the issue.

[MrMThree]

yea, as mentioned, misfire code for each cylinder
joey informed me about the recall being done right now, so prob just going to bring it to the dealer and crosss my fingers

[justin]

Willing to put all my money on the Coil Packs. Mike I got a few spares we can swap in to see if thats the issue just give me a shout on my cell.

[Sam@elitemotors]

check your coil pack harness for cracking for damage in the wiring, also if you really want to find a vac leak the best way would be to run a smoke test on the motor. If your still stumped and would like us to take a look at it, please let me know...

[MrMThree]

joey told me they're doing a recall on coil packs. giong to bring it by the dealer and see if they'll do it, if not, sam and justin you guys will both be hearing from me

[a4spoolin]

Sounds like you got a leak still. Run a boost leak test, its very easy. How many miles on the car? Those check valves and vacuum lines get extremely brittle.