Fixed!!!! Faulty crank sensor. Replace sensor and ran on the track for 1/2 hour without any problems. The sensor tests fine, put it on a scope to check wave forms, OK . heated it up and was getting a variable wave form.
Thanks Marshall. The plug was locked in. I did remove the sensor tonight, there was very fine metal fillings on the magnet… scary. The sensor has strange marking like a crack. Have 2 spares will refit and try again.
