Starting problem

[Halon]

As of like 3 days ago, my car all a sudden started having a starting problem. When I go to start it, it'll start but not fully. It'll just kinda start for about a 1/2 second, never go above 500rpm, and die. Kinda sounds like it fires barely and just kills. So far I have checked compression which is 150-150-145-150. There is a spark present on all 4 plugs. I took off the return line from the FPR and turned it over to make sure there is gas pumping through, and there is fuel. Base timing is set at 8BTDC when the plug is grounded.

This is a 91 talon awd. Mods are 50-trim, exhaust, intake, 2g MAS, EPROM ECU with keydiver chip. 650's, 255hp... The only thing I can think of is maybe it has something to do with the fact that I'm running the 255hp on a stock FPR. But then if that's the case, why was it starting for the past week and a half just fine?

Anyone have any insight?