Ok so I have a 99 Miata with virtually no mods, the only "mod" it has is the over clocked ecu and the cat has been hollowed out.

Ok on with the problem, it just started today about an hour ago. When I go to give it almost any amount of gas it wants to cut out. I replaced the plugs, fuel filter about a year ago and i just replaced the fuel pump like 4 months ago. If I slowly give it gas it will rev up but any abrupt throttle increase and it cuts out, not stumbles but just cuts out. Also when I go to start it it wants to stumble when starting. It idles kinda high at first but then it will go down to a normal idle and sit there perfectly.

Any ideas?