Ok, I'm almost done with my project and now I've run into a trans problems. TH400 with a CK performance tb. Solenoid works with engine off. However, once I crank the car. The solenoid will not engage. I have 12.70 volts to the noid (running or not) 150psi trans pressure in any gear or park. I can push the noid in mannually and everything works fine. I have tried two noids. Any advice would be appreciated.