350 motor was running rough at low speed and hard starting. runs great with mapp unplugged so i put in a new mapp, nsame cthing runs terrible when the mapp is plugged in and great when its unplugged?

Asked by Feb 03, 2017 at 03:54 PM about the 1990 Chevrolet Chevy Van

Question type: Maintenance & Repair

90 gmc 350

1 Answer

thank you

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