Hi all. I've been trawling the forums and haven't really found the answer I'm after so thought I'd ask and put it out there. My car is a 2001 AMK S3 with 98k on the clock, and yesterday it developed a bit of a misfire/judder, it idles perfectly, but judders only on full throttle around 4000rpm. However, if you don't give it too much throttle and let it cruise past 4000rpm, it doesn't seem to be as bad (although not 100% performance). From what I've read, my first port of call was the coil packs, so I went out and disconnected them one by one, expecting one of them not to affect the idle if it was faulty. However, all 4 of them made the idle rough & lumpy, so not sure if it could still be one or not? So I took it for a spin round the block to see if it was still happening, then my engine light came on. Now I'm worried. It's coming up for service time so I guess plugs etc have been there a while, but I think this could be a bit more serious.
if anyone can help, or give any sort of advice it would be a help.