I believe I have water in my gas tank? In 4th and 5th gear at 40 mph, and giving it gas the front of the car is shaking. I can feel it with my foot on the gas peddle. Oreillys said there is a miss fire in cylinder one. I had the plugs, wires, rotor and cap replaced and it is still doing it. Any suggestions?

I would suggest further diagnosis. Replacing secondary ignition parts may have been good maintenance but the route cause of the rough run needs fault traced.

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