2000 F-150

I've got a 2000 F-150 Supercab with a 4.6L V8. I've posted before, but I can't seem to find the post anymore. So here we go again. Sometimes the truck will hesitate when I drive it to the end of my driveway and stop everyday. It has quit on me once, but after I drive it, it's fine. For a while my door locks haven't worked right. The passenger side will lock most of the time when I hit the button or when I put it in gear. The driver's side will lock sometimes when I put it in gear, and never when I hit the button and neither side will unlock when the button is hit. I tried taking the acutators off and cleaning them, but after an hour of trying to figure out how they come out, I gave up and put everything back together. I checked the relays in the dash and they're fine. What else could it be, and if it is the actuators, how in the hell do I get to them. Also, how do I fix the windows? They slow once they get about half-way down, then speed back up again. Oh yea, and how can I install an oil pressure gauge along with the "gauge" I already have? I can't stand not knowing what my oil pressure is any longer. Thanks for any help.