I did the compression test and all the cylinders even the bad one was around 150PSi. The cylinder is still not firing or misfiring. i took the spark plug out and it was black on the end of it, the other spark plugs was kind of white. There is oil on the bottom of the distributor cap, but no oil inside.. not sure where that leak is coming from. I also changed the fuel injector on that one cylinder. When i first start the car, it idle fine until it heat up to normal temp. not sure what else to do. could it be a sensor or something.. maybe computer not responding.. i dont know