Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum banner

idling rough

  1. General
    Just this morning without any warning my engine began to make this terrible gravel or sand like noise. It started in a parking lot when I was about to park. When I left I noticed it immediately after starting the engine but the noise dies down and occasionally goes away completely while...
  2. Engine Tunes/Mods
    Ok not sure if I am in the right forum but here it goes... I have an 03 Trailblazer LT EXT 118,000 miles... it has been idling rough for a few months..the hubby changed the spark plugs and found oil on the threads...getting really bad gas mileage...oil pressure is higher, ranging between 40-60...
Top