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Hello. Is P0108 the only DTC?
The P0108 is a MAP sensor code. The map malfunction is likely the cause of the random multiple misfire condition. Have you done anything with the map sensor?
OK. Please take a look at the map sensor. Make sure there are no obvious problems with it. If you would like, I can email you the step by step diagnostic procedure for the map code in a PDF for 5.00. Usually it will be the result of a failed sensor.
Would you like a copy of the diagnostic instructions for the map code?
Ok, so you replaced the map and that code is gone but now there is a new code? The P0353 is a cylinder 3 misfire indicating a problem with the primary circuit. That could be from a damaged wire to the coil, A bad coil itself, etc Look over the coil and the wiring. Look for any signs of loose connections, damaged or melting wiring.
How did it all look?
Ok. Try swapping the coil with the other one you have and also check for possible damaged wiring else where in the engine compartment, like near the rear of the cylinder head, etc.