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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1 Answer

Why is my # 4 cylinder missing on my 2004 chevy trailblazer


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Engine misfire at idle


130k on the I6 engine isn't even broken in yet! We regularily get 300k on them. Couple of things come to mind, the "miss" you're feeling in gear is probably motor mounts, have these checked along with tranny mounts. I've seen them so bad it feels like it's running on 4-5 cylinders. 4-5mpg???? never seen that on these engines, any check engine lights? I'd take this to a shop and get it hooked up to a Tech 2 to nail the problem down. You have a lot of things going on that needs a pro's attention. Hate to see you throw parts at it not knowing exactly what's causing what problem.

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I have a 2004 6cyl. trailblazer EXT. My check engine light has been coming on then going off for quite some time. Had catalytic converter replaced 2 years ago, put on new gas cap a year ago, and...


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