My daughter bought a 88 chevy celebrity 4door just a few months ago and all was good. Low mileage and looked like brand new because an elderly couple had it garaged and only drove it very little. It ran great for a couple of months but then she got a full tank of bad gas and it sputters and one and a while dies when it has to idle for very long at a stop sign. We have changed the fuel filter and we are fixing to do it again. It acts like what you described. Could you have gotten a tank of bad gasoline? Her car is gradually getting better and I was told I may need change the fuel filter 3 times and I put gas treatment in the tank. She didn't have the money to take it to mechanic and have tank drained.