Timing Qs on new EFI Swap

I am new to this forum so I apoligize in advance if my Qs have been covered before. I am finishing my EFI conversion and am having a little issue with timing/running.

Specs - .030 overbore, E303 cam, stock H.O. intake and MAF, L1C EEC and a MAF converted Crown Vic. harness.

Prob - With the SPOUT disconnected I can get the engine started and set the timing (currently 10 BTDC) so that the engine runs. When I connect the SPOUT the engine will continue to run for some time and seemingly well but when I shut it off it is very hard to restart. I mean really hard. I can sometimes get it to crank but most times I have to disconnect the SPOUT to restart.

This is my first EFI conversion (and this little set back has not discouraged me from my next) so I am open for suggestions. One thing that I do need to mention is I may only be supplying 8-9vdc to the TFI on pin 3 which is the 12v Start Only.

Thanks,