1992 300 CE 154K miles. All of a sudden after running fine I went to start car the next morning and the ABS & ASR light came on and the car would not idle. If I keep foot on pedal it will run but as soon as I take foot off the car dies. Car has a new battery and just put in a new alternator and is working fine.

Any help is greatly appreciated.

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Moohampshire
1988 300E 124K
1994 Volvo 850 Turbo 115K Killed by a Cement Truck
1992 300 CE 95 K
1986 300 SL Euro 96K

First thing to check would be the OverVoltageProtection Relay, behind the battery I think!

How do you check the OVP?

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Moohampshire
1988 300E 124K
1994 Volvo 850 Turbo 115K Killed by a Cement Truck
1992 300 CE 95 K
1986 300 SL Euro 96K

I would not bother checking the OVP relay, I would just replace it with the proper replacement part from either M/B or the aftermarket. Your symptoms are those of a failed OVP relay and even if it is not bad [unlikely] it needs to be replaced due to age. The OVP relay can develope internal, intermittant open circuits as well as having the fuse[s] blow due to jump starting the car or crossing the battery cables during battery replacement. Just replace it with a good quality relay and see what happens.