This is an update to a previous problem. Occasionally when I'm accelerating, my engine will lurch (like a sudden drop into a low gear) and do one of two things: 1. Immediately die and sometimes have some problems restarting 2. Re-engage and pick up speed, and the tachometer needle bounces for a few seconds before stabilizing. I got my clutch replaced last summer, so I thought that might be a culprit. I also had three OBD codes (232,131,214) until I replaced the crank sensor this past weekend. Now I have codes 232,131, and 133. I haven't been able to clear the fault codes on port 2, so I think 131 may just still be in memory, but why would I be getting 133 after replacing the crank sensor? If anything, my engine idles low, not high. And what would be causing my lambda control to be off?
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1989 740GL 177k

Try disconnecting your( positive) battery post and leave it off for 15 minutes.This will clear the ECU memory.Be sure to have your radio code on hand.Install your cable post back,drive the car for sometime and pull the codes again.Good luck and keep us posted.
George.

If your tach is dropping to zero when this happens then you're probably loosing the Hall Affect sensor signal from the distributor. Could need a new distributor, sensor or cable.

I didn't think the 89 had a hall sensor, and I can't find one on fcpgroton. Can anyone comment?
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1989 740GL 177k

http://www.brickboard.com/FAQ/700-900/ElectricalIgnition.htm#DoesMyCarHaveaHallorRPMSensor