Hello well I’ve been having stalling problems on my 92 Mercedes Benz
400se I figured it was the throttle butterfly valve that was having a
hard time opening so I used fuel treatment and i cleaned the the butterfly valve.
Now after I turned it on the rpm in park and neutral is around 1800
which seems a little bit too high. However when it’s in drive its
normal. Reverse is the same except for a jerking motion after i put it
into reverse (the jerking happened after the cleaning) . On top of that
when in drive it seems like the car accelerates on its own.
Did you get the air intake tube back on correctly after cleaning the “throttle butterfly”?
A constant high engine idle is a classic issue caused most commonly by a vacuum leak.
A frequently used method by professional mechanics is the use of
starting fluid or brake wash. Simply spray around the engine with it
running ( not on the exhaust ) and listen for a change in engine noise.
Once You have found the area, turn the engine off and check for cracked

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