I've got a 1987 300e with a jerky cruise. It feels like someone is tapping on the gas pedal. I've replaced the speed sensor on the back of the speedometer, I've had the amp rebuilt and I've lubricated the speedometer cable and my speedometer is rock solid. It would also seem that my throttle linkages are reasonably tight, but of course I can't really reach the actuator under the intake manifold.

I suspect 2 things:

1) the alternator is an AutoZone rebuild and does not provide real clean DC. Could an unstable voltage be causing the jerking???

2) the cruise actuator

Any help is appreciated, especially the help that doesn't have me buying and replacing the dreaded actuator.

Thanks,

Bob Kopicki

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Bob Kopicki
Massillon OH
'97 VW Cabrio (POS)
'93 Miata
'87 300e
'76 GMC C-15
'67 TR-4a