Sounds like the injectors are dirty assuming everything else is good (like gas). You can try some dump in Sea Foam and see if that helps with the idling. If not you may need to pull the injectors and do a proper cleanout. If you have a TuneECU and can plug that into your ECU it will give you some pertinent data as far as vacuum pressure and other bits to help diagnose your problem.
 
I would spray the springs returns on the throttle bodies with wd40 or other cleaner
Do a wot and let it fly shut a couple of times.
You can use a thermal gun for checking which cyl is not firing
 
Sounds like the injectors are dirty assuming everything else is good (like gas). You can try some dump in Sea Foam and see if that helps with the idling. If not you may need to pull the injectors and do a proper cleanout. If you have a TuneECU and can plug that into your ECU it will give you some pertinent data as far as vacuum pressure and other bits to help diagnose your problem.
All I run is ethanol free. I'll give the sea foam a shot. Amazing I happen to have some on hand...
 
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