Ill have to try that. On an related issue I just had the other day I came out of the doctors office and tried to start my truck when it was about 100 degrees out and it would start and run for a split second and then quickly die. I tried several times before opening the hood and pulling the main lead going to the distributor and resting it above the ground lead on the battery (bad idea I know due to the explosive gasses a battery produces but it was the only place i could see it) I then noticed when I would turn the key it would arc a couple times then stop even with the starter still going. I thought I was going to have to call AAA for a tow but I put the cable back to the distributor and waited a minute with the hood up and tried it again and it fired right up and didn't give me any more problems after my next 2 stops that day. Could this be a issue with the new coil overheating or is the ECU or Ignition module killing power to the coil? I guess the ECU only monitors the ignition signal right? Its an 87 so it was built before the capacitor plague of the 90's and I've had it open before and it seemed like I checked the ESR on them and they were good, how reliable are the ECUs and Ignition modules in the older 2nd gen trucks?