Cat GP25, 5AM01193, starts and runs fine when cold, after short time engine starts to miss and then dies. Will start right back up and run for a shorter period then die again, will do this several times with the run time getting shorter each time until it won't start and will sometimes take out ignition module. If you take alternator out of system runs fine and doesn't die, had alternator checked and rebuilt by reputable rebuilder but still same problem, any ideas?