I am working on a 1998 Tahoe 5.7l 2wd. I was approached to see what was wrong with this vehicle. The owner had several people working on it. Fuel pump, fuel filter, tune up, new computer and ignition. The vehicle will start up and then, shut right back off not even a second later. There is no trouble codes at all. I am thinking that it can possibly be a bad crank shaft position sensor. But, like I stated, there is no codes at all even with the old computer back in it. The Tahoe has over 200,000 miles on it. Any advice will be greatly appreciated. Thanks in advance.