The air plate position sensor and the coolant temp sensor have alot to do with this system. Additionally, I would check the idle air valve. The easiest way to check this is when it is failing. This is when the technician would want to work on it.
Have you replaced the OVP relay? If not, start there.
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Benzmac:
Donnie Drummonds
1991 GMC Syclone
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM
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