chugging or eratic

  1. intermittent chugging/eratic idle

    have a toledo tdi 110,starts up ok but once it begins to warm up slightly idle gets lumpy and really chugs like a misfire when doing low speeds up the gears esp in 3rd and 4th,not as bad when im on motorway doing 70/80mph. tried fuel filter and treatment.sorted it for a day but then came...