Take out the plugs they are probably all black from too much fuel, it sounds like its running too rich, and the black smoke proves its fouling plugs. After the fuel ruins the spark plugs they foul out and cause a rough idle and a shaking type of feel.
Before you remove the spark plugs do this. Turn the key to on, then off, on, off, then on and leave it on, watch the 'check engine' light. It will start to flash on and off, count the flashes. The diagnostic mode ends with 5 flashes and another 5 flashes. Code 55. Ok? I am looking for a code 11, or 13, or 22, or 51, or 52.
Let me know what codes you get, this diagnostic mode must be done within 5 seconds. As many times as you want.
I'm thinking the o2 sensor or coolant temp sensor may be bad. These would cause an overly rich condition so before we spend any money on plugs lets make sure of why its running so rich and with a high mileage car(and a good car also) many things could be wriong. Ok?
This is a 2.2L engine? 4 cylinder? We will try this now ok?
Monday, February 15th, 2010 AT 9:21 PM