Possibly a bad distributor cap and rotor. If it gets worse when it is damp out I would be almost 100% sure thats your problem. Your looking at about $20. You may have a bad fuel pump. Check fuel pressure. When you hit the gas the car demands more fuel so the fuel pressure may not be there to meet the demand.
RepairPal Certified shops can diagnose and repair your 1990 GMC R1500 Suburban. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
