Okay, caught up with tasking and actually came home early with the new starter waiting to be installed. Starter installed, drove the car without any HHO, the car still kept running for a second or two after key is off. I changed all the small vacuum line being used as coupling, still the car runs after the key is off.

Where can I look next? I was wondering if the lenght of the tubing coming from the "Banjo" bolt is pre-dertermined, I mean what happens if it was cut short to remove some extra tubing.