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Hi all, new to this forum. I have twin 2013 DF115A that sat for a long time, I do not know the full story before the engines were parked but was told they ran fine. I went thru the entire fuel system and changed all fuel lines, filters, pumps, fuel, and cleaned the VST very thoroughly. the engines will start and idle perfectly and will run at WOT no problem but will only spit and sputter at RPMS from 1200-3000. I have checked the fuel pressure and it is in range at startup and will remain that way for 90-120 seconds and then drops to 22 PSI. once the engine completely cools it will run at normal pressure for another 90-120 seconds. any input?