do you have accesss to a scanner?
if you have, can you go to LIVE DATA while you are cranking the car:

while cranking: look at the "RPM" data and see there is something showing


still at the live data, (but this time when the car is finally running)

look at EVAP PURGE and EGR ( during initial start-up, none of them should be "on") not until you are in closed loop (normal operating temp).


still at live data, (but this time when in closed loop) (normal operating temp)
look at the LONG TERM FUEL TRIM and let me know what percentage it is. dont forget to mark If its + or - its very important.

let me know, or pay somebody to get these info for you and ill help you trouble shoot this baby