Did a tune up, but something's not right
 

When i changed the wires I did them one at a time and made sure the new ones were the same lenght as the old ones. When I got to the last one it was the plug furtest from the cap on the right side. The only wire I had left was much shorter then this one, it wouldnt even reach. So not knowing where I went wrong I had to rearange the wires till they all fit. Now my car is running really rough when I accelerate up till about 2100-2200 rpm then its not that bad. it is also idling at 800-900 which is 100-200 higher than before. Did I mess up or did they give me the wrong set of plugs? If I take them back for new ones I need to know the right order they go in

Yeah, you just crossed a wire somewhere. If you have a chiltons manual or any ford manual, it tells you the correct firing order. I am shure some one here remembers it, but a book for 10 bucks gives you all the details...

1) Firing order for your car is 13726548.

2) Your 5.0's distributor turns counterclockwise.

3) The #s on the cylinders read like this: standing in front of the car facing the engine, on passenger side of vehicle starting at left side, closest to you (farthest from firewall) is # 1, then going back toward the firewall is #2, then #3, #4. Then starting on right side (driver's side) closest to you is 5, then going back toward firewall, #6, #7, #8.

So with this information you can make sure you have the correct arrangement of plugs (firing order).

For example, looking at the distributor cap, you can see a "1" on the top. Starting from "1" on the cap, circle like a clock, but counterclockwise and the next is 2 (not read), then all the way to 8 notches. Match them up to the motor in the correct way using the info above.

As far as a shorter plug wire. Just about everytime I've gone to get new plugs for my Mustangs (whether the '92 or the '79, the coil wire in the box is wrong (too short), but the rest are right, and many times I've just left the old coil wire on there.... :(

Also, make sure you check that you didn't knock off any vacuum hoses (coming from your intake or anywhere else) or that none of your hoses are corroded or old and weak b/c a rough idle is sometime indicative of bad vacuum, but REALLY rough idle in your case is more likely messed up fireing order, but you may only have 2 crossed if any, b/c if it were more than that, the car would barely run right, which doesn't seem like your situation.

BTW, my experience has been that if it idles higher rpm, it's more a vacuum leak, but running lower , sounding like trying to die and maybe even backfiring is more due to screwed up firing order.

as it turns out, I'm retarded and didnt notice one of the boots got disconnected from the plug. its running fine now. thanks