ok, so i have a 95 bronco with a 302 with about 20096 miles on it. it will idle just fine but when you start to take off it lugs and the trany shifts hard. when you reach about 25 or 30 mph it lugs and sputters. when i get on the gas i feel a hard knock in the rear end. which is an 8.8. and when the truck get on the highway it gets hot and runs really hot after 25 min. i just had a new junction box and a new computer put in. and today i was coming back from the store i was backing up and it died and everything shut down and i smelled burning wires. now nothing works at all. HELP