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2002 Chevrolet TrailBlazer LS 4dr 2WD



Questions & Answers

Q: What could be causing the engine to be idling rough? ?

2002 Chevy Trailblazer running rough when idling, especially when its cold and it sometimes hesitates. The engine sounds like it is missing. Thought it was because I got some bad gas but still having the problem.I have replaced the fuel filter, spark plugs, ignition coil #2,4,and 6 and 2 yrs ago I replaced the throttle position sensor. When i replace the fuel filter i notice the gas that came out of it was very dirty. I have also used the fuel injector cleaner a few times when I filled up with gas.

Mechanic Q: What could be causing engine to run rough while idling??

2002 Chevy Trailblazer running rough when idling, especially when its cold and it sometimes hesitates. The engine sounds like it is missing. Thought it was because I got some bad gas but still having the problem.I have replaced the fuel filter, spark plugs, ignition coil #2,4,and 6 and 2yrs ago the throttle position sensor. When i replace the fuel filter i notice the gas that came out of it was very dirty. I have also used the fuel injector cleaner a few times when I filled up with gas.What else could be making my engine run rough?