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Re: I have a 2002 Chevy Trailblazer. Just replaced
If you unhooked battery it will need to relearn its idle position, should help if you clean throttle blade edge and body of carbon so proper amount of idle air can enter engine.
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If you can get it to run, take it to an o'Reilly's or another part house that tests batteries on the car - they do it for free. They can tell you what is wrong.
It sounds like your EGR valve needs to be replaced. You can go to any auto parts store and get one. Try replacing spark plugs and plug wires also. If the timing was off it would pick up speed slowly and would vibrate really bad at idle. When you go to accelerate if it doesn't accelerate normally it may be the timing but i highly dought it. Try plugs and wires first. then the EGR valve.
try changing the air filter ,i had a problem ,at ilde in drive my trailblazer would stall, changed the air filter now it's not stalling and got my power back ,there is a secondary air pump that i have to change ,
not sure were it is ? still not running perfect but it's running better .and my service light is on too.
i got it put on scope ,it's the pump .
not sure if this helps ,but i'm start to run in to problems too,i have a 2004 trailblazer.
i like to do fix things myself ,i hope i can.it's the cost if you know what i mean.
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