Here's a trouble-shooting solution for the Crossfire EFI, a USB interface cable that plugs into the 12-pin OBD1 ALDL diagnostic port behind the ashtray and connects to a laptop USB port (I use WinXP):
ALDL OBD1 OBD cable OBDI OBD2 engine codes

I use WinALDL software to check the engine sensor voltages to see if they're up to snuff and within normal operating parameters as well as error codes, open/closed loop conditions:

Hope this helps.