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[jcb]

I have a 2005 Challenger with the SCIC engine, was running great, using at least twice a month and then had to leave in garage for approx 3 months, took it out and it ran really rough and in fact went DIW, until after multiple attempts to start it finally did. Ran it out for 5-10 minutes then it ran great the rest of the day while wake boarding. Thought it might be bad fuel, filled with new gas & added some injector cleaner. Next weekend took it out and had a repeat of the same problem, few weeks later same thing happened. Have inspected plugs, all appear good. While running have diconnected the plugs one at a time and have had mixed results to isolate a cylinder. At first it looked like the #1cylider was not firing due to no change when disconnected. Then it changed to the #2 cylinder. It seemed to be either #1 or #2 but not consistent. but still once it was fully warmed up and at higher rpm it runs great. Yesterday was trouble shooting again and it appears to now be both #1 & #2 cylinders.

Any advice on what to check next?
Best place to purchase a shop manual?

Thanks,
Jim