This is driving me nuts! I cant seem to pin it down and my computer has a ton of stored blink codes. So maybe once or twice a week my car will crank and crank but not fire up, no hesitation or stalling it just wont even try, give it a minute or so and it starts up just fine. This has been the only problem other than a clogged up PCV sense i got it. I know its not the fuel pump because i got a new one last week. The codes i got relate to crank shaft position sensor, RPM sensor (? tac works fine), coolant temp sensor (prevented my last volvo from starting so maybe), fuel trim part load i think, front knock sensor, MAF, and some ABS codes. I think it could be the coolant temp sensor, MAF, or crank sensor but if it was really the crank sensor it wouldn't start at all is my understanding, i also considered the fuel pressure regulator but that would cause hard starts. Really I just need some advice on this because sensors are really expensive and i rather pin down a part or parts before throwing money at the car.

Little more info but could be unrelated, when it does this I turn off the A/C fan and it starts right up but could be just letting it sit for a couple seconds was all.