Been keeping tabs on how my car is running, I changed all the plugs, rocker cover gasket and the spark plug seal as I had oil on the spark plug hole (oil all over the spark plug) So thought maybe this would be the reason as to why the car runs slightly lumpy. But it still runs the same, it's missing quite badly. Can you guys suggest anything else? Was thinking distributor cap and rotor arm but it was replaced by the previous owner..