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Never got around to do the leak down test. I did do a coolant pressure test, that passed. I noticed when i give the gas pedal a hard but quick push. It sounds almost like i have a CAI (sucking or harsh blowing), i have stock air box with drop in k&n filter. I have yet to trace down the sound...

Well, compression test results were identical. Became up with 110 psi in each cylinder. Engine light hasn't been for a while. I go over a mountain every other day. It usually comes on as I am going up, will see if it comes on today, on my way back

That might be exactly the problem, when I took off the air duct work to throttle body. I flipped it open with a bright light I seen what looked like oil drip in there and it smelled of motor oil. The compression test was my next step. Thanks a bunch for posting your outcome

Yup, papa Karl suggested the compression test, so pressure test it will be.

Okay, CEL came on again. Got code pulled, misfire still in cylinder 1. Have swapped plug, coil pack, and injector. Suggestions?

Okay, switched around 1 and 2 cylinder injectors tonight. Cleaned all of them up with carb cleaner. The car doesn't have any hesitation, don't notice any major power loss, starts fine. However I have noticed it uses a bit more gas than used to. I sure hope it's not a valve either. Will post...

Yellow eye, I used the chevron fuel addictive. Still have the same results, engine light goes on and off, mostly during higher RPMs and when engine is working harder. I have used that product several times on the cobalt and my gmc sierra.thanks. Bockwoldt that was my next step, to swap...

Rechecked codes, they were p0301(cylinder 1 misfire) again and p0300 (random misfire). Still thinkin injectors. Just curious to see what advise anyone can give for my next step to finding the.problem ?

Bockwoldt, swapped spark pluggs in cylinder 1 and 2, and swapped coil packs on cylinder1 and 3. Engine light shut off, it will be on after a while. Will run engine code again. Thanks, will keep updated.

I have the same problem, my first thought was the fuel injector. I first got code p1174 (fuel/air mixture imbalance), I found my purge valve was stuck shut, I got it to start purge breathing again. My CEL shut off, but came back on a few days later. I checked code reader and it came up with...