well i got my 96 yokon 350 vortec a few years back ....when i got it i was told the cruise controll works sometimes and the trans was shifting funney ,,,found out the trans was the troq converter not locking up ...so i have ran my own switch to manually lock it up ...my the cruise will just shut off out the blue and not work for a few minuites or a few day depends on how the truck feels ( i was told about the brake light switch but didnt solve the problem),,,i was told it started after having the flowmasters put on it...but now i blew the heater controll switch 150 dollars for a used on and i am blowing radios like crazy ...they work for mabe 5 minuites to 30 minuites and than no sound .gone threw 4 stock radios one sony and one jvc .and sometimes the trans shifts smooth from first to second and sometimes it shifts so hard i think the rear diff is gonna explode ....i am at my wits end and ready to give up ....i have been thinking about all this for years now and all i can figure is mabe i got a bad ground somewere from the back serge from them welding the flomasters on it ....has anyone had any of these problems on any gm fullsize from 96 to 99 2000 ish are suppost to be the same setup ...