Intermittent SES Light

[c4zr1]

Well I thought I had my problem solved, but need some help. I did the AB pin jumper and getting codes 34, 44, and 54. I can drive the car about 5 miles and the SES light will go off and the secondaries start working. By the time I get back home after 10 or 15 miles the SES light comes back on.
I have checked and the vacuum pump and lines holds pressure, I changed the MAP sensor out. By the way I sent my ECM off to Tom Henry Chev. and had it rebuilt as well.
I wish I had a Mark or Cory close by, but I am way up in the Texas Panhandle and there does not appear to be anyone that knows anything about ZR-1's close by. If I have to I will load it up and take it to Mark or Cory, but I thought I would try solving the problem myself if I can.
Do I nned to invest in a Tech 1?
Any help will be appreciated.

Thanks!
Don