i had the same thing happen to me, and it was day and night different. also mine happened in the middle of driving it, i was driving it home on the freeway and lost so much power i coudnt pull 40mph, limped it home, had to go up our hill in 4low in 1st all the way up. got it home pulled the sparkplugs did a compression test, number 2 had none. dumped oil still only went up to 10, figured must be in the valve area, pulled valvecover off wiggled rocker arms, #2 exhaust was so tight the valve was open. it now runs like a top