Allright here's what's going on. I have a 1990 fullsize with the 302 in it. This problem seems to happen most often when i am offroading, but it also appears on the road. while i am underway either accelerating or moving at a constant speed, the engine will miss for 1-2 seconds, then come back. Sometimes it stalls. The check engine light usually comes on when this happens. I have noticed this only occurs when i hit a bump in the road. Even while driving on a smooth road if i hit a bump the engine will momentarily miss, and the light will come on. Sometimes the light will stay on until i turn the engine off. It's getting annoying cause i'll have high rpm's trying to navigate a trail, and i'll hit a bump and lose all the rpm's i had wound up. So, i was wondering what some possible reasons are for my truck doing this. As always, thanks for any input.