Moomba/ indmar throttle problem

This weekend my 06 outback V with the 325 assault in it started acting up. I am not 100% sure what all was going wrong because my dad was using it while I was working, but the main problem was that the throttle was not responding until pressed to about 50% throttle. Long story short it was in need of a new belt for the alternator. I figured that that must of been causing the problem, maybe from not enough voltage for the electronic fuel injection. After I replaced the belt and cranked the engine it was pulling 14 volts, but still had the throttle problem. I am not sure if it could cause such a problem or not but I have a fuel filter on the way, regardless of that being the cause of the problem or not I have been needing a new one. So unless the fuel filter fixes the throttle I am not sure what the problem could be. My next step is just checking all of the grounds, fusees, etc unless you guys have any suggestions. Thanks.