Can anyone help with a stalling/running problem?

My 92 Buick was running great when we stopped driving it because we had other vehicles. It has been about 18 months since it has been driven except to move it to a different area of the yard. We decided to sell it and drove it to the gas station to put some gas in and it did fine on the way there, gas was very very low in the tank. Additive was added to the tank at the station to hopefully clean up any old gas left in it. When driving home it started kicking and sputtering and finally died. Towed it back to the house, replaced the fuel filter and a couple of rotted vacuum lines but it will not stay running more than about a minute. It is acting like a vapor lock, meaning it's acting like it's not getting gas all of a sudden. Any suggestions?