What you should do is build the Arthur Dalton code reader and pull the error codes. Then clear them all and see what comes back in a day or two. Post up the results.

I have a '93 124 with the 2.8 liter M104. Last year it had a nasty idle surge, stumbling on acceleration, and generally lousy running. After evaluating the codes I decided both the MAF and O2 sensor were shot.

Replacing the MAF completely cured the driveability issues, but the idle surge remained.

Replacing the O2 sensor corrected the idle surge. It is impressively smooth now.

If yours runs exactly the same with and without the MAF disconnected, that's a good sign it's shot and is being ignored by the ECU. But I wouldn't spend the couple hundred on a MAF without first building the $10 code reader to be certain.

- JimY