what it sounds like is that you need to have the basemap setup to disable the baro sensor or fix the issue with the wiring.. ) in alot of cases in FL the sensor isnt needed since we are located on sea level. but somewhere in the moutains the Baro sensor would help you out, as it will adjust the tune according to the densedy(sp?) of the air..

As for not starting. its sounds like the basemap might be off a bit.. That happens sometimes even with well known tuner basemaps, every car is diff.. best bet is to have a local tuner disable your Baro in your basemap and go from there