I have 1993 300 E , when accelerating it's missing to the point that unless you stomp it its going so slow people are going around me. while at idle the oil needle is holding constant then will jump from say 2.5 to 1 on the gauge. the car was overfilled with oil, but I had the oil changed its now at the correct level. And I changed the plugs making sure of the gap. this was no help. Also the car does not smoke or seem to use oil. I don't have the money to pay for shop and need to fix it myself if at possible. ( please help me)