My 2003 chevy venture idles rough when i start it but runs fine when giving it gas.i just did a tune up but used four point spark plugs could that be the reason?
"trick" spark plugs are just that. You can only make one spark at a time so therefore regardless of the number of contacts, that's all you get...one spark. Put the right ones back in and make sure you have the right wires on the right plugs.Also make sure you didn't disconnect any vacuum hoses while you were working!
Yes if it didn`t do it before you replaced with the different plugs
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