ive replaced starter ig switch and fuses still wont start with key any ideas

no, there is no alarm, factory or aftmark.It would start with key but then it wouldnt, all the lights and dingers come on when key is on and I could jump the terminals on the starter and it would run but now even w/ key on it wont let me jump it anymore. I can hook up a remote starter switch to te energizing terminal of the starter and it will crank but not run.

WITH THE KEY DOES IT CRANK BUT NOT RUN?

NO, IT ONLY TURNS ACCESSORIES ON, DASH LIGHTS AND RADIO. WHEN I PU A TEST LIGHT TO THE ENERG WIRE THERE ISNT ANY POWER TO IT WITH KEY ON

sounds like a skim prob in the ign switch assm, thats if it has one ,call your local dealer with your vin# and see