What is your question?
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What is your question?
White smoke out of tail pipe and now random misfire after changed sparkplug and popping sound when in park
How long has your 2015 GMC Sierra 1500 had this problem?
1 week after white smoke
1 Reply
Have you verified all plugs are properly installed, properly gapped (where applicable) and have the coils installed as necesary? You don't indicate the engine size, but i'm assuming coil on plug ignition on this vehicle. Ensure all vacuum hoses and air intake parts are installed properly. Contact a local shop near you for hands on guidance as needed -- https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.