I have a 1989 Model 126 300SE ( Engine 103.983 auto) which has recently
started mis-behaving on start up. Even on warm starts it frequently rev's
at 2000rpm and does not drop back to the normal tickover of about 650. On
other occasions it will go to about 1200rpm and only occasionally will it
idle at 650. Sometimes I can start up and, if it runs at either of the
higher levels, I switch off and re-start to the correct rev's. Also
sometimes I can give about 25% gas on the pedal and it will start correctly.
I've checked that throttle linkage is not sticking and have cleaned the air
flow sensor plate and housing and checked that it's centred and free moving.
Where do I go from here?
I'd really appreciate any suggestions.
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