It is not a transmission issue, the trany shifts fine.

It is like the throttle is overly sensitive.

Even w/ the cruise control on, it either has too much throttle or too little. The car surges forward or falls back.

Also, when it is acting up, the vacuum gauge sinks farther into the red than usual. Give it a tiny bit of throttle, and the gauge swings into the red. So I am thinking a vacuum issue.

This is an intermittent thing, worse on cold days.

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1990 560SEC
1988 300SE
1978 928 euro S engine, big brakes, and more
1996 Suburban TX shark rig
1988 Suburban Pacific steelhead rig
1992 300 TE (recently totalled )