After driving an hour or so car suddenly loses power. If I stop for a few minutes, to gas up for instance, car operates normally for a shorter period of time. When I rev the engine just after pulling off the highway it drops to idle speed from about 4500 rpm. Engine will cut off if driven long enough after experiencing condition. No warning lights. ???? Fuel contanimation? I replaced filter recently. Could tank filter at pump be clogging? If driving on hilly winding roads I do not notice problem.
