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1989 GMC 1500 with a 350cui, pops back through the exhaust when decelerating and as soon as it starts up it pops out the exhaust. Also when driving on the interstate running 70-75 the check engine lig

\015 I have checked the rotor and cap for corrosion and cracks - all looks good. Have not noticed any loss of power, it idles fine no miss, just a pop through the exhaust intermittently when idling, at start up and when you turn the engine off it does a final pop everytime\015 Posted / edited by AnonymousUser on : 23-05-2022

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