I have chevy trailblazer 2004 .... at idle rpm goes to 1000 ... cam shaft sensor changed, gas pedal changed, throttle body changed o2 sensor changed, spark plugs changed, fuel filter changed and checked the obd codes... ive got p0452 code... is it resposible for this.... please help

It could be the throttle position sensor.

knowing GMs in those years, i'd check the CRANKshaft position sensor and the damper pulley/sensor wheel assembly way before the cam shaft sensors, as they had some probs with that for a while (late 80s and up usually), and second i'd check the IAC (idle air control) located on the throttle body. It looks like an electric motor and only has 2 torx screws holding it there. It controls the amount of air that goes into the engine at idle, and more or less closes up when you press the gas, and they were known to get dirty and jammed real fast on GMs, cause all kinds of great problems. Like on my 1990 Chevy Cavalier, when it jammed it either sputtered and died immediatly, or started to rev up to around 3k-3.5k RPM, often both sputtering and revving like crazy, and being automatic i had to hold the gas and brake on stop signs and red light to keep it stable and keep it from moving.

have you gone over the throttle body and changed the idle position solenoid. They go bad and that acts like a cork , when it is stuck. It creates the air bypass , when you are idling. Take the intake snorkel off and look at it, clean it. take off the throttle body and you will be amazed at how much crud is under the butterfly plate. That crud gets into the throttle position sensor and the idle solenoid valve. I changed those sensors ( everything is $40.00 each for those ) and all idle issues went away. Have not been back for 2 years. Remember that fuel injected engines have an air pedal. it's not a gas pedal. If air is cut off at idle the computer can't compensate for it beyond a certain point. If it is running rough, then you also have to look at loose wires, spark plugs, head gasket integrity.

You may have a oil pressure switch going bad or your idle is too low. The idle should be around 600 RPM. The oil pressure displayed on the instrument panel gauge is not an actual reading, it is made up by the computer. You probably should clean the throttle body as well, make sure to clean both front side and rear side thoroughly. Also disconnect the battery while doing the cleaning. This will allow the computer to reset and relearn.

The P0128 is your thermostat. Your engine isn't getting up to temperature, is probably stuck open.

P1680 has to do with your pedal position sensor. Either way, your PCM either needs to be recalibrated by the dealer OR replaced. This depends on where your VIN # falls on the list of the technical service bulletin that is out there.

Your SUV has an electronic throttle body. Unlike the other type which is driven by cable, this relies on multiple sensors in the gas pedal and multiple sensors in the throttle body. If one or more of the sensors don't agree (i.e: one sensor says you're at 80% it while another says 40% throttle) then it goes in to a default mode or "limp home" mode. It basically makes you take it to be repaired because it is unsafe to be driven.

Sounds like you might have a failing TPS or Throttle Position Sensor.

The part attaches to the throttle body with three torx screws.

Before that, try battery disconnect reset by unhooking the negative battery cable and depressing the brake pedal for a minute or so.

Reconnect and fire it up to see if idle is still high.

P0037 HO2S Heater Control Circuit Low (Bank 1 Sensor 2)
P0507 Idle Control System RPM Higher Than Expected
bank 1 is the side with number 1 spark plug but the o2 sensor is going to be the one just before the catalytic convertor. the other codes has to with idle and you either have a vacuum leak (which would cause eratic idle(up/down))or you have no accelerator cable and there is a problem with one of the sensors either at the throttle body or on the pedal assembly.

its most likely the throttle body is dirty, just remove the air box on top of the engine and clean the throttle body out with carb cleaner.

Check your throttle position sensor