installed a new factiry spider assembly and still a misfire. only happens under stress going 70 + mph up a hill at 3000k rpms

Asked by Nov 10, 2016 at 07:38 PM about the 1999 Chevrolet Suburban K1500 LT 4WD

Question type: Maintenance & Repair

1 Answer

63,065

Usually when an engine misfires under load it's an ignition system problem. Are you due for a tune up? I'd do that first. HTH. -Jim

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