Idle speed relay
What is your question?
Idle speed relay mounted on drivers side valve cover ...has four wire connects new on order at auto parts store has five wires not sure how to wire it in. To the old original four wire pattern
What makes this problem better or worse?
Loss of power when i drive over 50
How long has your 1990 GMC C2500 had this problem?
2 weeks
What are the best GMC repair shops?
RepairPal Certified shops can diagnose and repair your 1990 GMC C2500. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.