1999 Honda Accord shakes when accelerating

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1999 HONDA ACCORD
4 CYL
FWD
AUTOMATIC
117,000 MILES

1999 Honda Accord mileage: 117,000 My Accord has an automatic transmission 4 cylinder, I bought this car recently and there waren't any problems. All of the sudden when I start it up it starts shaking when driving or when giving gas. I have change the oil, then I change the cable and the spark plugs. At first it started working fine, but after fifteen or twenty miles of driving, it has the same problem. I talked to a mechanic and he suggested that it might need the head gasket valve seal cover changed. We found the first plug on the left with some oil in it, in that cylinder we had no oil when we first change the plug after driving a while the oil comes in that cylinder and also from muffler there is white smoke. So can you tell me what could it be?Thanks

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We would like to start with the white smoke. First of all, the white stuff coming out the tailpipe is water vapor. That points to a head gasket. In order to get to the head you must take off the valve cover(s). You have a seal or two going out on the plug wells. We would like to add that the shaking is probably the vehicle not running correctly. We would venture that one of the plugs is cracked or a plug wire is bad. Also given the water vapor coming from the exhaust, one of the plugs or more is also tasked to boil water and therefore is not able to fully take care of the job of igniting gas. There is possibly another issue here. What caused the engine to overheat and take out the head gasket? You should be looking in to that as well. We suspect a leak in the cooling system is present and responsible for this.