How's it going guys? This is my first thread so take it easy on me! I've done a few things to my car...swapped the steering wheel, have changed fog/head/tail lights, installed cold air intake and have done a few other things to it. I thought i was a genius! But the day i found this forum, I realized I really didn't know much.:dunno: I have a 98 Z3 1.9 roadster and got a big time acceleration problem. Without even having to floor it, my car starts.."jumping". This is through any RPM, at any time. Weather doesn't seem to make a difference. I've replaced the knock/ping sensor. According to my mechanic that was the problem, which was causing my car to use extra fuel. I fill my gas tank about 4 or 5 times a month and i really don't use my car much besides heading to work and gym. Any ideas? O2's maybe? MAF seems fine, I've also replaced the air temperature sensor. Any suggestions will be greatly appreciated!