I've researched the forum and found a number of posts related to this issue; however, no confirmed solution or fix. Essentially the engine starts up and runs perfect; however, at about 55 - 65mph at a steady speed the engine begins "bucking" or hesitating and then surging. If I accelerate the problem stops immediately .... it only occurs at light throttle pressure at constant speed and not all the time it only happens intermittantly. Since it has occurred over multiple tanks of fuel I don't suspect poor fuel is the cause. The vehicle has 193k on the odometer and I've got relatively new injectors and all new fuel lines and delivery seals .... so there is no air in the fuel system and I seriously doubt that air in the fuel is the problem. I also recently replaced the K40 relay so that can't be it. Additionally, there are no trouble codes stored in the computer so I don't think its the flaps in the intake system since on the '97 models there is an electronic feedback loop to the computer to indicate if they are open or closed and improper operation throws a code. Since the problem starts and stops rather immediately, like a light switch turning on and off, I suspect some electrical control issue. Any ideas as to where I should check/investigate next?

David Roseman
Long Beach, Ca