I have a 94 Grand Prix 3.1L and here is the problem. It just seems to happen randomly, when it does happen i am just cruising down the road and all of the sudden the engine will surge from 1500 to 2100 it will do this several times and each surge will will last for a second or so. I have replaced the fuel filter and it was better for about a week and then all of a sudden it started to act up again. Also put new plugs, new wires, and new ignition coils in about a year ago. any advice, suggestions, or solutions would be greatly appreciated.