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I have a 98 626 with an ongoing problem that is driving me (no pun intended) nuts. It a 2 liter, 5 speed that has 200,000 miles (not 'k') on it that has been the best car ever that I've had. The only thing that I've ever had to replace is a 1/2 shaft due to a torn boot. I can't get rid of a misfire that I've had for a couple of years. I've replaced the plugs, the plug wires, the fuel filter, the coil pack. I've tried various fuel conditioners and higher octane gas all of which has very short term improvement. I 've he engine sputters at low rpm's when I step on the gas. If I let off the gas and then rev it again it is usually fine. It runs fine at higher rpm's unless I push on the gas too hard. I've read a lot lately that it may be the mass air flow sensor that needs to be cleaned but I'm not sure. Does anyone have ideas? Thanks in advance, Adrian