I have to say my old 88 M3 has been fine until today. After leaving it for a month at Heathrow while I was abroard it now seems to stutter, it's not ignition I am sure as it doesn't drop onto three or anything and i replaced the coil, leads, cap and arm not so long ago. I reckon this could be a fuel pump issue.

I have to say though all in all I love my BMW!!!