2009 Chevy Malibu Misfire Code 3904

I have a 2009 Chevy Malibu that is giving an 3904 misfire code, which appears to be a misfire on cylinder 4. The malibu has about 105k miles. I have replaced the spark plugs, and the ignition module and fuel injector for cylinder 4 with no luck. The misfire code appears to come on when the car is warmed up and has been idling for several minutes. The engine runs smooth at high speed, and appears to run smooth for a while at idle after I clear the error code. The error code comes back when I pull up to a stoplight or am in heavy traffic (idling). The only misfire code I have seen is 3904.
Dumb question... 3904 error code is for cylinder 4, right? Not the 4th cylinder in the firing order?
Any suggestions on what to try next would be much appreciated. I'm just about ready to take it to a mechanic or even the dealer.
Thanks.
Dumb question... 3904 error code is for cylinder 4, right? Not the 4th cylinder in the firing order?
Any suggestions on what to try next would be much appreciated. I'm just about ready to take it to a mechanic or even the dealer.
Thanks.
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