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Please help! My 1983 380SL rev momentary from 900 RPM to 1500 then back to normal after shifting from park to reverse, neutral or drive. If shifting is quickly made the car would jerk when gear is engage. Any help will be appreciated. <br> Thanks
 

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Hai,<br> <br> I had the same issue, the only resolution was to replace the check valve and idle control unit. The engine also had a habit of stalling when coming off of a freeway and RPM dove suddenly. The fuel pump shuts down automatically at 399 RPMs with the nominal idle at 500-600 RPM.<br> <br> The fix was about $150 using a remanufactured idle control and a new idle control check valve.<br> <br> Good luck.<br> <br> --Kirk
 
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