error code= misfire #1 cylinder. plugs, wires and coil changed. No Change on 2005 Ford Freestar

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I have changed the plugs, wires and coil and the van still runs horrible. when you are accelerating it runs very slugish and has a miss to it. once you get up to speed it runs pretty good at constant speed but if you accelerate, it will start missing again.
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Roy is right start with the basics. Three things can cause a cylinder to misfire, mechanical issues (low compression), fuel (a bad injector or lean mixture in that cylinder due to a vacuum leak)or loss of spark. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate
the first thing you always check is the compression. without that, all the parts you threw at it mean nothing.
from there you move forward with vacuum leak checks, injector, plugs, wires etc.

when i changed the coil, plugs and wires, the code for Cylinder 1 misfire was reset and has not came back but the van still runs rough. the check engine light has not come on since those items have been replaced but its like its bogging down, if that makes sense. it will accelerate through it and runs pretty good at 55-60 mph but if you step on it, you'll feel it. its worse when your at low speed, especially when your starting out from a stop.
What I have found is the is water getting on the PCM, which there is a technical bulletin about that from ford...there is also a YouTube video that will show you how to fix that...everything will have to be dried out because of a leak where the windshield wipers are located ...I can give you the YouTube video address if you need it...
Did you ever find out the problem.I have a 2005 ford Forrester that is doing the EXACT same thing.