We replaced sparklugs but engine is still misfiring. Why? on 2005 Chevrolet Colorado

We used platinum spark plugs that the auto parts store recommended. A friend recommended radium plugs. What is the difference?

by in Vancouver, WA on March 17, 2012
1 answer
ANSWER by on March 17, 2012
post eng codes that can be read by auto zone for free. DO NOT BUY MISC PARTS TILL YOU GET PROPER DIAG.