I have a 92 rs 305 that I am having a huge problem with it has been to 2 mechanics one being at chevy dealership I have sunk a bunch of money into it and I am at a loss!!!!!! Problem is wile driving I lose all throttle car still idles fine if I turn engine off and restart in neutral wile rolling I get throttle back for a couple miles have replaced so much and mechanic at chevy made me come get car because he could not figure it out so had to pay them for nothing PLEASE HELP I DON'T WANNA GET RID OF MY CAR