Definetely change fuel filter, even more after sitting that long, guess you flushed the tank too? See what happens after...if still the same unplug the 02 sensor (while cold) and start the car see if it runs after warm.
Edit-it will throw a code, need to reset the ECU after.
Pump Gas 385whp 319wtq
Race Gas 551whp 439wtq
Tuned by Fernando@RacingPartsSolution.com