my uncle has a 6.0 power-stroke 4x4 van that has a miss when warm. he was driving down the road and hit a big heave supposedly tossed the van sideways and when he came to the next light he had a miss. took the van home checked the oil level and everything was fine but had a miss. let it cool down for a day went out and started it everything was fine. drove it around until it warmed up and miss was back. with no mil light on or anything its hard to find the problem but he thinks its a EGR because its the only thing that is effected by warming up. and him hitting the big heave he thinks he knocked some soot loose or something..... any thoughts or have it happen?