G20 distributor Problems ?

[KICKYERASS]

Hello all. I just picked a 1996 G20 with 156,000 mi on it. I wanted to use it to go back and forth to work, with gas prices so damn high feeding my 04 Nissan Xterra is getting costly. Ok on the G20 my Check engine light is on the codes P0325 (knock sensor) and P0125 (Engine coolant sensor) and P0734 (A/T 4th signal or tcc) is coming up, the prob I'm having is that the car when sitting for a whilr starts right up and runs great. When you shut it off after a while and try to turn it back on it doesnt start, engine cranks over but it doesnt want to start. I was told it may be the distributor or the coil module in it. I'll replace the whole thing if thats what it is..not sure though. Maybe someone on here has had the same problems and can give me some advice..I thank you in advance for your time and help....