New here and hope i can get some real help. I bought my son a 98 gs and bought a doner car that ran and drove for the 420a engine in it. Got it together and my son drove it for two months and it just died. Now i have changed every sensor, relay, fuse, pcm, fuel pump, and even wire harness. If i leave pcm out and battery disconnected for a few days the car will start and run for about 2 minutes and dies. there is no power to coil or to cam and crank sensor. I have read forums and post about this problem and havent found a problem that was solved. i have changed everything that could be the problem and still exist. I really hate to part car and junk it since it such a nice and fun car to drive. Any ideas that i might have missed something please help, thanks