setting up a 3v 4.6 on engine dyno?

We're trying to get a 3v running on an engine dyno - complete factory setup. Not sure what we're missing; it'll fire occassionally, but then shut down right away. We take the same PCM and stick it in a car, engine fires right up.

PATS is disabled (BTW, the disable/enable are backwards in the tuner), clutch switch is disabled. What else am I missing? Anyone done this?

better, does anyone have a tune file already setup for a dyno I could look at?

Are you running the same exact airbox/air-intake as installed in a factory car?