Can any one help me out I have a 1996 m3 evo, when I can the car sometime she idles fine then after awhile starts to run rough. After heating up I rev her abit and she runs smoothly then after awhile starts to run rough. Any suggestion on where to start?
Definitely get it on a diagnostic, but add a possible air leak to the list - perished hose under the airbox or similar. Probably not the MAF, but worth checking that too.