[jclotz]

I had this same problem with my newly-built 2.7 MFI. It would cold start fine, and start fine after a short off period when hot. But would be hard to start if it sat for about an hour or so - when not hot or cold. I fixed the problem by adding a momentary switch (actually a button) at the dash that would trigger the cold start solenoid and inject some fuel. Now when in that condition I turn the ignition on to start the fuel pump, open the throttle half way, give the button a couple of pushes and it starts great.