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I know this thread is old, but it seemed to stimulate some good conversation. My car is experience intermittent hesitation. It typically happens in cold conditions and always when the engine is warming up. It also has misfires when idling, cruising, etc. It happens some when warmed up, but not a ton. No idea why. Previously I had a CEL. The dealer blamed bad gas (I was running premium) which fouled spark plugs. I was initially bit skeptical of the diagnosis, but accepted it. Things seem to be getting a bit worse, I'm still on the gas the dealer put in the car.
Regarding the conversation about misfires causing CELs, I've monitored and logged OBDII data and I've definitely had non-zero misfires, more than I would have expected without a flashing or solid CEL.
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