2007 Chevy Cobalt has random misfire on cylinder #2 at idle when the engine is at...

seth

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...operating temp? Engine has 54000 on it. I have tested everything i can think of with no luck : Scoped injector pattern, Scoped coils, changed plugs, Cylinder leakdown test good, Compression test all cylinders were 250psi, checked vacuum system with smoke machine. I cant figure it out if anyone has any suggestions it will help or if you have the same problem let me know thank you.
 
random spark plug plug wire coil injector if you have replace all try valve or cam
 
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