So, here's the low down. The truck will idle normal then randomly cut out and come back some times stall. When driving does the same thing it will stall if I'm not on the throttle, I have replaced the cap/rotor, plugs, wires, rebuilt tranny 10k ago, I've taken the throttle body off and checked the iac an cleaned it completely, when I take the oil fill cap off and turn it upside down on the fill hole, it doesn't have any suction so I don't believe it's the intake gasket, I recently checked the intake through the throttle body and there isn't any oil, and last time I had it on a scanner the tps checked fine. So, any suggestions?

 

failing cam or crank sensor? Will your scanner do data logging?

 

Yes, and thn sync cam is running a half the crank speed, checks out
Normal.

 

Log crank and cam sensor signals. See which one appears to be intermittent. Another possibility is the ASD relay, it power the coil, and injectors. Could just swap for the horn relay, and see if that doesn't solve things.

 

You need to plug the intake hose to check for vac at the oil cap.

 

Which hose are you talking about ? The one that goes into the breather? I can't think of the name right now lol

 

Fresh air intake to the crank case. The tube that runs from the air hat to the valve cover.