unplug the battery and hook it back up. the misfire and check engine light will both hp away and once the light comes back so will the studder. do you have a black top cam angle sensor? if not get one and it will make the light stay off for longer. you can get an eprom and a burnt chip ($300 or so) and that will get rid of your problem for the cheapest and you can get dsmlink down the road.
Yeah mine had the same problem... seemed to happen less during the winter for me .. but since getting the ECM/DSM_LINK I've had no more problems!
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