Frustrated and lost

[i:5f44bc072b]

I have a 1991 Chevrolet Camaro Z-28 and it has 94,000 miles. I have a computer problem with the car that has left both myself and every mechanic that I have taken it to thoroughly lost. I've replaced the entire computer three times so far because every computer I put in there has done something else to the car other than fix the problem. I've already re-wired the car twice due to things shorting out. We originally fixed the computer to fix the speedometer. It still doesn't work and the sensor that runs it is fine. Fuses blow in the car now. I can light a cigarette from the car lighter and blow every fuse in the car. I replaced the window motors with new ones because they died somewhere near the second computer replacement and they still don't work right. The trunk is power and it won't work either. If I blow the horn, I blow every fuse in the car. To make matters worse I've replaced the thermostat three times now as well and the car keeps overheating. Chevy told me that the computer is not the problem. I've had 3 electricians look at the car and check the wiring, the computer, all the sensors, and fuses and everything is deemed in perfect working order so what I can't figure out is why these things keep happening? Can anyone give me a suggestion on where I should look next? I'm so lost right now and short of tearing the car apart and building it myself.I've no idea where to look next.[/I:5f44bc072b]