Sounds like you may have a problem with the cooling fan. Our 89' daytona shelby had 2 different problems with the fan. The first one was the relay that kicked the fan on/off went bad. You may want to check the electrical connection between the relay and the fan. That was our second problem. There was a short in the wire and occasionally it would work properly. I guess you could try either of these if you have an electric fan. Hope it helps some!