Every once in a while, my 98 bravada acts weird while driving. it only happens after i've driven about 20 miles and it only happens once every couple weeks. the transmission will start to shift very harsh. when i accelerate from a stop, it will spin the tires a little when it goes into second gear. the other shifts are also harsh. it will then throw an engine light which is: "transmission component slipping". i'll reset the light and the next day it's fine again. i also noticed when i bought it that when i shift from park into drive there is a delay. i recently changed the trans filter and fluid. the truck has 98000 miles and everything is still original. are these problems related?