Ever had this happen with your ignition switch?

[Diesel Giant]

Well here is the latest update. I have narrowed my problem to 2 things. 1) is a bad vac switch on drivers door. Its leaks when the shaft moves from one instance to the other. Part on order. The next thing is I connected my vacuum guage in series to my shut off valve to see how much vacuum was being applied when the key is operated. As expected there is no vacuum signal while the engine is running. When the key is turned off, there is about 15 inches of vacuum applied to the cut off solonoid. This is more than enough to shut the car off immediately. But what happens next perplexes me. When the key is turned back to the start position the vacuum is between 8-5 inches. This should not be. With only 7-8 inches of vac it will hold the cut off solonoid closed so the car will not start. If I cycle the key several times off - on it drops the vacuum to almost 0 and the car starts right up. My guess is the ignition switch is not working right.

Any other suggestions??