98 C230 No RPM's when accelerator is pressed

[BadBrad97]

I have a 98 C230 with 80,000 miles. Recently the check engine light has come on and there have been days on and off in the past week where it has run badly. I.E. Lack of power, missing, and hesitation shifting. I had the dump from the computer done at Advance Auto and the only error that it had was a "Misfire on Cylinder 1". I replaced the spark plugs, as a start, and the next day it seemed a little better. Today, when it was started it idled very smoothly but when the accelerator is pressed "at all" it starts to die out and miss. The harder you press the accelerator the worse it gets. I performed the cheapest and easiest fixes that I know. I replaced the air filter, sprayed out the throttle body with choke & carb cleaner and replaced the fuel filter (under the car in front of the rear axle). Before I start throwing parts at it, does the fact that it had the "misfire on cylinder 1" lead us to believe that it has to be a coil or wire next? Or is a dump from an auto parts store not reliable? I am 3/4 of the way through the tank of gas on which these symptoms started. Could it just be bad gas?

Any help you can give would be appreciated.