Have you set your base timing/Ignition Offset Angle yet?
Ignition Settings/Ignition Options/Fixed Advanced-->Fixed timing to 10 degrees
Tools/Trigger Wizard/adjust as necessary.
Then set the Fixed Advanced back to Use Table.
(I'm on my 2nd day with the same unit on my '94... didn't have any issues once I was able to get the TPS to register properly.)
Also, are you using the MM9495_Miata_331a base map from DIY?
Once I had the car started, and warmed up, I ended up setting the base idle manually to 850 at the throttle body.
So far, so good. Not dialed in by any means, but it starts nicely. Will raise the idle to 1400 or so when cold, as the base map has it doing/etc.
What wideband are you attempting to connect?
I've got the AEM UEGO. Power (red) tapped into 1B, Ground (black) tapped into 2A, 0-5V signal (white) tapped into 2N.
That way the wideband signal should be getting passed into the DIYMSPNP where the factory O2 sensor is feeding it's values.
I'm about to head out and install the wideband now. Make sure to disconnect your factory O2 sensor under the hood...