Check Engine Light On Problems of Mitsubishi Raider

Got truck may 2007 from a Toyota dealer with 15k miles after driving it for a day with no problems. After papers were signed, I started the engine and the check engine light was on. The Toyota dealership told me to take it to a Mitsubishi dealership since it was still under warranty. The engine ran fine. The following day the check engine light was no longer on. The Mitsubishi dealership said it may have been caused by the gas cap being loosened by the Toyota dealership when they filled the gas tank at the time of purchase. Shortly afterward, the check engine light came on while driving 35-40 mph and immediately ran with a rough idle and bucked when accelerating. The following morning with light still on, but no rough idle or bucking, Mitsubishi dealership tests determined it was the #2 spark plug, which they corrected. Several days later it happened again. The following day the check engine light was no longer on & engine ran fine. This happened 3 or 4 times a year through 2009. I noticed that if the cruise control was on when the check engine light came on, the cruise control light would turn off and no longer function. After turning the engine off and restarting it, it no longer had rough idle or bucked on acceleration; however, the check engine light remained on and the cruise control light would still not come on or function until a day of two later when the check engine light was no longer on. A couple of months ago, 2 to 5 minutes after starting engine in am & while driving approx. 35-40 mph, engine killed & check engine light appeared. Engine restarted with rough idle, bucking with acceleration & the cruise control would not function. Two weeks ago, while signaling a left turn, the dash blinking lights began blinking on the right & the check engine light appeared, engine killed, etc. Just happened again. Getting dangerous. . . Help!.

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