Want this question answered?
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.
Check throttle positioning sensor.
700 RPM
The idle air control valve on a 2004 Trailblazer is located inside the coolant system. This valve regulates the air that comes into the cabin.
The engine of a Chevy Trailblazer may begin shaking when idle if there is insufficient fuel reaching it. This can be caused by a clogged fuel filter or dirty fuel injectors.
It sounds like your fan clutch is bad.
You may have leak in the intake
it ranges from 800-1200 rpms just depends on what you like or what ever makes it sound the best!
A bad idle control module will make it race up to about 3000 r.p.m. when in park.
Most cars will idle high until the engine warms up. If your car continuosly runs high have the fuel system checked.
if the vehicle shifts and drives fine. the most probable cause for this is a high idle. most vehicles idle at around 650 to 700 rpms. when warmed up, check or clean the idle air control if idle is high. good-day !
Check the power to your automatic choke and check the choke pulloffs. It sounds as if the fast idle cam is not coming all the way off.