my car is ok as long as it's moving, but whenever it stops in front of stop sign, will go rough idle badly, my al619 scan tool show fuel system status CL OL-drive ... CL if it stops not for long, if it stops for a relative long period of time, the fuel system status will go from CL to OL-fault, and stay there even I start driving again, and fuel trim and O2 sensor all stop function, next time I restart my car, everything go normal again as long as I can avoid idling. I will appreciate it if anybody out there can give me a hint what's wrong with my car.

 Let me more specific, I noticed my car had rough idle with engine light on problem some time ago, a scan tool gave OBD II codes P0300 P0303 P0304, I swapped Coils and Spark plugs around, misfires always at cyliner #3 & 4, next things I did including seafoam, throttle body & idle control valve clean, the problem still there, then I noticed the problem described in my last post, if I can avoid idling during routine drive, misfires with the above OBD II codes will not appear. I am new to diagnostic car problem, but looks to me there are some kind of electrical failure after misfires, what you guys think?