Can anyone help diagnose this? My 94 325i runs fine when it is cold out and the engine is cold. When it is warm out or the engine is warm, it runs horribly. It studders when you give it any more than the slightest bit of pedal. It doesn't stall, it just slowly accelerates studdering along. The car is high miles so I don't want to put a bunch of money into trying to figure out the problem. I'm hoping it's something common that has a definite solution. Help is appreciated. Thanks!