02 trailblazer rough on idle and coming to stop
 

I have had this car for alittle over a year now and it has been running pretty rough at idle and when you come to a stop if feels like it tens to shake and sometimes as if its going to shut off. Also I noticed now at a stop my "check gauges" light comes on and my oil pressure gauge is pegged at zero but when driving it goes away and is normal. Another problem I am having is that my volts gauge fluctuates and most of the time its no marks below 14. The last major issue I am concerned with is when I start up the car and shut it off the motor shakes a bit and like I stated previously at idle it does as well, I can feel it through the pedals and the steering wheel.

Just out of curiosity, when was the last time the throttle body was cleaned? Sounds like it struggling for air.

trailblazer
 

To be honest....I have no idea. Whats the proper way of doing so? Whats to be used?

Get some carb/throttle boy cleaner & an old toothbrush. Hoold open the throttle plate, spray cleaner in it and on the toothbrush, and scrub. After I spray some on a rag then wipe it out. Put it all back together and start it up. Might run rough for a little bit, but it'll straighten out. See if that helps.

trailblazer
 

Thanks a bunch! I will have to try that this weekend.

04 trailblazer questions
 

Hello, I bought a 2004 Chevrolet Trailblazer and when i test drove vehical all was good, the next day after i purchased vehical it started idling rough at stops and red lights. I took to Mechanic and it was throwing 3 codes which all three pointed to O2 Sensor, took it back to lot where i purchased and they replaced o2 sensor and when i got home it started idling rough again. since then i have figured out it only does it when heat and air is off. any suggestions? also i figured out the the Check Engine light has been disabled, any suggestions on getting this light re-enabled?

Thanks in advance

if it helps my 04 trailblazer is the LT model and the EXT 4wd