I have 99 audi a4 with a GIAC chip. A month ago, my car started sputtering and misfiring badly a low acceleration and at idile. The cel light came on, and it would sputter or shake at low acceleration, and cel light would blink. I had it scanned and it said a misfire on cyl 1 and 2. I bought new spark plugs and replaced coilovers 1 and 2 with new ones. I gapped the spark plugs to .028. Once they were replaced, it still sputtered and idled rough. Codes were saying it was misfiring on all 4 cylinders.

I took it too a mechanic and he scanned it and it said it was misfiring on all 4 cylinders. He replaced all four spark plugs and switched around the coilpacks and scanned again. It said a cylinder 1 misfire and still sputtered at idle. We then checked a ground control wire on near cylinder one, and it was not giving any spark. He then switched to another ground control and let it run. It stopped sputtering and he deleted the code. I drove home that day and had no cel light came on. The next day on my way to work, I was driving and i put it in 4th gear and it started misfiring. When I came to a stop, the light came on and it began to sputter again. I am out of options. I need help.

 

You need another scan to see what's misfiring now. Most parts stores will do it for free. Post your codes and diagnosis can begin.

 

I also have a 99 A4 B5 1.8 Non turbo 190k ditto the above, almost! no chip, I have tried new plugs, new leads to 1-2 as I directed no spark to 1. then a second hand coil pack from eBay and it failed MOT in UK so a new cat was fitted and no codes they said when resetting airbag light. any help please!! for us both! thanks!

 

I had the same exact problem! Remove the spark plugs of the misfiring cylinders. The caps on the top of the spark plugs can be loosened. Give them a few turns to the left and put them back in. That solved the issue for me.

 

Come to find out that my ICM was faulty. I bought a new one and replaced it and now its running well.