van sat for 4 months. start van runs rough,won't idle.232000 on van.fuel pump? on 2000 GMC Savana 3500

van ran fine before starter broke.just replaced starter,now van is running rough,won't idle when foots of gas. can't see any vacuum lines off or bad ongas mileage,9-11 mpg.could it be possible fuel filter and/or pump?

Asked by for the 2000 GMC Savana 3500
check fuel pressure a mouse might have made a home in your GMC might be chewed off wire