I have a 95 1500 that at first was shutting off while driving. When I would put it in park and turn it off it would fire right back up. This happened two different times. The last time it shut down 4 times in 2 miles. I replaced the TPS as someone suggested it to me. Truck ran fine for a week then would not start. I then replace the crank senor. Ran fine the next two days. Now this morning it will not start at all. Any suggestions of things to try or check? I am totally out of idea, also it is not giving a check engine light.