The simple way to test for fuel control is this: take the O2 sensor lead and ground it, the mixtire should go rich. Next put one finger on the battery positive and hold the O2 sensor lead with the other hand; the mixture will go lean. If it does such then the controller has the capability - hook up an Oxygen sensor.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician