88 RX7 wont start

It all began when I was coming home one night and the car just lost power and kept loosing it till it finally died in my driveway. The car will crank but not start. I got it from a guy who blew the origianl and had this one put in with a T4 turbo and bigger injectors. The car has nitrous kit hooked up but he said he never used it and I never did either. I had the altenator tested and its ok. I also replaced the battery, sparkplugs, and fuses. Oil has been changed and ratiator flushes and new coolant put in. I believe it may be flooded or the coilpacks have gone bad. Please someone help.