My 87 260E started having cold start problems. I took it to the dealer where purchased, my independent mechanic retired 1 month ago! The plugs, cap, rotor and overload relay were replaced. The car starts ok now, but now I have new problem the car bucks at highway speeds. It feels like the fuel supply is momentarily cut off. This only started on the way home the shop. The car never did this before- 176K miles! Please help with any suggestions. Could the new relay be defective, or bad fuel pump, or accumulator. I am bringing the car back tomm, but would like a heads up. I am afraid to drive it.