Question about 2004 Chevrolet TrailBlazer

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I have a 2004 Chevy Trailblazer 4.2 engine, It runs fine at Idol, but on the road it misses real bad, the Check Engine light dosent come on, I changed the Plugs but it didnt help, I thought it might be the EGR valve, but that year and the 4.2 dosent have a egr valve, does anyone know what the problem may be???

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No air coming from a/c vents. Maybe its a vacuum lines

Posted on Jun 18, 2011

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First thing to try would be spark plug wires. Then your timing, and check for vacuum leaks. ie: broken or loose vacuum lines, loose intake bolts, etc. But it sounds like plug wires.

Posted on May 08, 2009

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