Hey yall. Your misfire problem could be a rocker issue. The Gen III 3400 that the Aleros have, utilize a roller rocker with steel bolt in an aluminum head. I've had this problem happen on mine 3 times. What happens is that heat build up weakens the threads in the head and they eventually pull out resulting in rocker failure. They basically loose all spring tension and float. The Intake and Exhaust Valve stay closed creating a dead miss, fouled, and saturated plug. There is an inexpensive fix if you are mechanically inclinded. A heli coil kit is available to repair the problem. If done properly this will fix the problem with much satisfaction. Any other questions let me know.
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