i've posted this in the tech section and gotten not response so i figured i'd try another area.

i have a 1998 audi a4 avant with a 2.8 30v engine. last week i had the engine light come on and then flash and then all hell breaks loose. it idles really rough but if you drive it it runs fine sometimes and other times it runs like complete ****.

i scanned it last night and i got 8 engine codes.

p0422 - bank 1
p0432 - bank 2
p0300 - random multiple cylinder misfire
p0301 - cyl 1 misfire
p0302 - cyl 2 misfire
p0300 - cyl 3 misfire
p0305 - cyl 5 misfire
p1519 - manufacturer specific code

i have no idea where to start. i thought at first that it might be coils since i was getting all the misfires, but after reading a little about p1519 it seems like it could all be some kind of intake controler. i have no idea. anyone with any kind of experience with this would be appreciated.

i think the 2 cat codes are independant from the others. it's probably just a wierd coincidence.

again, help would be greatly appreciated.

 

Start by changing the plugs. It could be causing the misfires and then sending more fuel down the exhaust causing o2 sensor issues and even failures

 

i pulled them last night to see if they were fouling out but the weren't all that dirty. i guess i could just change them for ***** and giggles.

 

the problem was a bad coil and a really bad vaccum leak. all fixed now. thanks for al the help.