If the check engine light has not come on, it is most likely a vaccume leak.
IT could be a faulty transmission or the belt could be grinding up against an unknown source. = )
Check the Cats have not disintegrated.
There are several things that can cause your 2004 Chevrolet Trailblazer to idle rough. The most common causes are a dirty fuel filter or a dirty air filter.
I don't know for sure, but I have the same issue (2004 Endeavor LS). I have asked a mechanic this and the only answer i got was that it could be an exhaust leak. I haven't actually got it looked at, have you found out anything new?
A dead battery would not cause an engine to seize
There are pages and pages of things that can cause a check engine light. You need to have it checked with a scantool. Then the code can be diagnosed and repaired.
Check the EGR vavle
I just had this problem on my 2004 Colorado. The Idle Actuator control motor on the throttle body was bad. Cost $160 for the part.
The check engine light in a 2004 Toyota Tacoma can come on for many reasons. It could indicate an exhaust leak or a problem with the engine.
The cast of In the Rough - 2004 includes: Douglas Sept as Brog Kirsten Severson as Oola
no cause a 1994 may have a bigger engine
I had the same problem with my 2005 ford expedition... it was my chamshaft....... The repair is expensive... But it fixed the problem......