car just started cutting out yesterday ,it will start and run fine one time and then it wont start or it will start run 4 a few seconds and just shut off like I turned it off ,I checked it when it wont start and it has no srark at all and then let it sit for 2 hours and it will have fire again and then loose it again ,I thought it was fixed today It started right up I drove it about 30 minutes turned it off it started right back up ,ran perfect and then I let it sit for an hour tried to start it and nothing again no spark and then 5 min later it started 4 about 10 seconnds,,wtf ,I have replaced icm,coil,map sensor ,opti is about 3 months old ,what else could it be? its a 93 transam..

 

That happened to me when my coil would overheat from the exhaust, i used alot of washers to kick it away and it all went great..

 

coil is new and relocated away from heat ,and it wont even fire on a cool motor .

 

you dont happen to have a MSD box on it do you?