it could be a lot of things unfortunately, the rough idle usually is fixed with the cleaning of the throttle body though..

 

First I'd go to a local auto parts store to get your codes read if your parts stores do that(they do for free in Seattle). I've heard of temp sensors, oxygen sensors and clogged pcv valves/systems also causing roughness. Those sensors can be checked with multimeters, theoretically I wonder if a shorted out throttle position sensor resistor element could cause a rough idle/misfire? Throttle position sensors can be a quick multimeter test as well.

 

vacuum lines.....

 

Ok.. a vaccum leak = LEAN, but I would check for leaks anyway.

I would say its the ICM though, alot of people have had problems with them.

If you have no codes for the MAF, then that should be ok.

New plugs wires - check
MAF/Throttle cleaned - check
Vaccum Lines - ????
ICM - ?????


I would look at those 2 items

 

when your CEL turns on, you have a minor problem...when your CEL starts to blink, TURN YOUR CAR OFF! a blinking CEL means something is very wrong. small things like vacuum leaks and failing MAFs will not cause the CEL to blink like that..the blink is a sign of a more serious problem.

 

Ahh, I didnt read the blinking part... im lazy.. what are you going to do

then yes, it is the ICM.. i will try to find a place to buy it from /part no for you.

hes a pic of it

 

AHhh here you go!

Link to ICM

103.96 Shipped.


Ive seen alot of people buying these for 120,150+

Autohausaz is a good site. I buy from them, quick shipping and good service.


Edit!!! Found LOWER PRICE

2nd ICM Link


98.60 Shipped!!! Saves you like 5 bucks.. but hey! 5 bucks is 5 bucks.. It lists it as 103.79 but all you have to do is put audi06 in the coupon code.. orders over 50$ get free shipping!

 

that does not look like a 2.8 airbox.cel will flash with a multi misfire

 

Its not, but thats what the ICM looks like.

On a 1.8T this is like a 5minute job.. not sure on the 2.8.. but Im sure its fairly easy to do

 

I just replaced my ICM a few weeks ago...EXACT same problem. Got mine shipped for $80 off ebay...get the HUCO brand for the cheapest. I read good reviews of them on AZ and mine has been working so far. I ordered it on Wednesday, was here on Friday and installed in 3 min.