My 1987 190e 2.6 has a serious problem. After driving on the highway for 10-20 miles, when getting off at the exit the engine sputter and stalls intermittenly. Sometimes 1/2 mile down the road (after exitting from the highway). The engine wont start right away. Sometimes it will start after 10-15 min. I can smell the gas when the engine cranks. I have replace the plugs, distributor cap and rotor, fuel filter, overload relay, and the crank sensor. There is spark at the end of plug. IT'S SCARY! Anybody have any ideas please help.