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toolboxchev · 03-31-2018, 09:51 PM

They did not come from the factory with model year 2018 Marvel Mystery Oil. Burn that crap out of there. Clean the plugs, check your vacuum advance make sure its working and plugged into the correct port. Focus on ignition and timing first, then carb.

Check out hotrodders forum links to Crankshaft Coalition. A ton of info there.

03-31-2018, 09:51 PM	#2
toolboxchev Registered User Join Date: Jul 2015 Location: 2nd left past the stump on a dirt road. Posts: 2,629	Re: Help with rough running engine They did not come from the factory with model year 2018 Marvel Mystery Oil. Burn that crap out of there. Clean the plugs, check your vacuum advance make sure its working and plugged into the correct port. Focus on ignition and timing first, then carb. Check out hotrodders forum links to Crankshaft Coalition. A ton of info there.