1976 buick 3.8 V-6 starts and idles fine all day. Put in drive warms up spits sputters backfire stalls. I have replace fuel pump fuel lines fuel filter, pcv valve, rplace coil, icm replaced, cleaned fuel tank. NOTHING! PLEASE HELP? Thank you

Asked by Jun 18, 2015 at 12:54 PM about the 1976 Buick Regal 2-Door Coupe

Question type: Maintenance & Repair

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Have you checked the exhaust back pressure?

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