Im having similar problems gentleman. had it happen 4 times where ill go to start it, it will crank but not fire, this goes on for all of 30 seconds tops, then it fires up as if nothing happened and is fine the rest of the time I am in the car. Any thoughts? have an exhaust and a plenum spacer if that will add anything to the decision.

 

*bump*

 

I didn't see this yesterday, but my problem was not intermittent. My car worked for 45k miles and then....it didn't.

That being said, the fact that all the "modules" communicate on a common bus line, and any of these modules can cause communication problems for all of them was news to me.

I don't know if you have a module that is intermittently doing what mine did in a constant state. If so, you will need a good tech, a good amount of luck, or both, to nail it down.

Sorry I can't be of more help...