I need help plz

Siphon out all the gas in the tank. Change the fuel filter. Hopefully it is not part of the fuel pump inside the tank, as in newer F-150's. Now check the fuel pressure at the engine. Gauges can be purchases for 25 bucks. The readings can be obtained from the net as well as the testing procedure. Check resistance on your wires via multi-meter. New Fords suppose to be about 5K ohms per foot, but check for your model. Use the multi-meter to check the primary and secondary coil. The NET will show you how. Check the easy and little cost items first. Don't throw parts at it until you determine the problem.

You could have some stopped up injectors cause even if you put injector cleaner in it they can still have a ball of gummed up gas in them from sitting up, or a bad coilpack because if you have the 8 coilpack system like mine I had to replace one just about every week until I replaced them all when I first got my truck, or a stopped EGR valve which happens to my 98 all the time, and as far as the vacuum system one of the lines could have a hole in it from being dry rotted and the only way to find the hole is to crank the truck and get a can of starter fluid and spray down the lines and if you hit a hole in the line it will start clear up the rough idling but the vacuum lines and injectors are probably your best bet cause they won't throw the check engine light