If you have never changed your plugs (yes spark plugs) and have 80k miles they most likely need to be changed. ford touts that they can go 100k and I just changed mine at 75. The car seems to run fine because you gradually lose your fuel economy. I changed my plugs and wires and gained back 2 mpg. It is a very simple DIY job. Many people think it is impossible to get at the back 3 plugs but it's quite easy. You will just need either a 9 inch extension or a 6 inch and a 3 inch together and a spark plug wrench. should take you less than an hour, maybe an hour if your a first timer, and the plugs will cost you 25 bucks. check the group buy forum for info on ford racing 9mm wires for 50 bucks which is the same as what you would pay at a parts store for shitty 7mm oem wires
