2004 Chevrolet Trailblazer
Repairs- new alternator
Question = i have a 2004 trailblazer when i turn on the a/c the vehicle idles down even when in driving
it so i turn the heater on and it did the same.
The problem you are experiencing is the engine is not getting enough air when the extra load of
the air conditioning is put on the engine. This is solved by a simple procedure. You need to clean
the throttle body assembly and that will take care of your problem.

Remove the ducting and plastic air intake that attatches to the throttle body so you can access
throttle bore and blade. Use a good cleaner, brake clean is recommended, and clean
thoroughly with a rag. Get inside the bore good and clean the throttle blade too. You really need
to make sure you get all the carbon build up cleaned off or you will still have the same issue.

Once finished, reinstall the ductwork between the throttle body and air cleaner and go drive the
Trailblazer. It might take a few minutes to get the rest of the cleaner burned out of the system, but
after a short drive, the engine will have learned a new idle setting and you won't have it idle down
or stall out when you turn on the air conditioning.

Chevy Trailblazer 2004. Engine  4.2L. My rpm is going down to 600  RPM and when i stop the
engine shuts down.
2004 Chevy Trailblazer.
After having the car dealership replace a relay for my headlights, I noticed my vehicle is
running slow. Noticed this Friday night two days after taking vehicle to dealer. Once I get
around 40, it's hard to increase my speed. On two occasions my truck has cut off while at a
stop light with an error message that fuel pressure is low and to stop engine. I just had an oil
change on 27 July and my fuel tank was on full both times. Please help before I spend another
$300 plus dollars with the dealer!
There is no such thing as a
warning light that says "FUEL pressure low, stop engine". Maybe
you mean oil pressure? If that is the case then you need to check the oil level and have the oil
pressure of the engine checked. It could just be a problem with the oil sender switch telling the
computer that pressure is low, but is is really not. Or you could actually have low oil pressure.
That would need to be confirmed by installing a gauge and checking.

This can cause the acceleration problem or it could be a different problem. Low fuel pressure-
which has nothing to do with the amount in the gas tank.
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Chevrolet Trailblazer Stalls with A/C On- How to Clean Throttle