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1996 S420 goes dead random. Only at very slow speeds or sitting at a light it will just go dead. Sometime at a stop it trys to go dead, then reves up and lunges forward. At highway speeds you can feel it try to go dead, but doesnt. All of this happens daily, but some days more than others. Yesterday it only happened 2 or 3 times. Can anyone help?
 

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1996 S420 goes dead random. Only at very slow speeds or sitting at a light it will just go dead. Sometime at a stop it trys to go dead, then reves up and lunges forward. At highway speeds you can feel it try to go dead, but doesnt. All of this happens daily, but some days more than others. Yesterday it only happened 2 or 3 times. Can anyone help?
Hmn. Could be a lot of things. How's the idle? Rough? Does it happen more often when it's warm?
Maybe a vacuum leak?

Have the codes read on the diagnostic computer, that will probably give you a lot of clues. Then come back, will make it easier for us to help you :) Getting the codes read shouldn't cost you that much, and you could even buy a computer to read out the codes yourself for not too much money.
 
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