hey so the enginge light came on a while back my mechanic looked at it nothing seemed to be off, it was a tranny code i dont remeber what one, so he reset the light it lasted a month then came on again i called him up and he was busy and said wait a few days so i did then it turned off by itself i thought that was weird, but now the other day the light came on again and now the truck lags somtimes when starting off driving or once you start driving it lags and feels like its in a high gear, my truck is a 1997 cherokee sport, any ideas?