I've posted a message about my 940 dying out. I replaced the radio relay today and it runs better. Now I disconnected the AMM harness while the car was running and nothing major happened. Is this an indication of a bad Meter? I also got a code in position 2 of 2-3-2 while the engine was running rough. Thanks for any help ... Jeff

Don't underestimate the power of cleaning the mass airflow meter's contacts, on both the harness and the meter itself. I've solved many a problem that way.

But then again, i've also replaced a couple of MAF sensors (or AMMs whatever you want to call them) and that too can fix the problem. They aren't wildly expensive either.

"...I disconnected the AMM harness while the car was running and nothing major happened..."

The prevailing wisdom is to plug-unplug the AMM with the KEY OFF. Otherwise you might damage an otherwise good AMM or ecu.

If disconnecting the AMM makes the engine run better then that makes the AMM a prime suspect, otherwise (as in your case) the test is inconclusive. Check running at idle and accelerate through ~2000+ rpm. The best way to check an AMM is to swap with an identical good unit. Also, it's not a good idea to connect/disconnect the AMM (or any other ECU sensor) with the ignition on. These components are too expensive to risk frying accidentally.

Your 2-3-2 FCU fault code (as I recall) is for running too lean. You cleared all codes after replacing the system relay, right? If the check engine light is not on then it may just have been a momentary condition so clear the code a second time just to be sure. A flaky AMM is only one possible cause. Carefully check for vacuum leaks -crack in air supply tube, disconnected or split vacuum hoses, leaky throttle body gasket. A bad fuel pressure regulator could also cause this. Other people may have some other suggestions for you.