2000 Ford Taurus

Engine Performance problem
2000 Ford Taurus 6 cyl Front Wheel Drive Automatic 133401 miles

I had a diagnostics check done on my vehicle and it said that the air pump was defective or the relay may be gone out. I was wanting to know what other damage could that cause if I don't get it fixed right away. In conjunction with that the read also said that my number 5 spark plug is misfiring are those two related because on Saturday it was just the air pump today it was the air pump and teh spark plug.
June 28, 2010.

Two separate issue
have or should have the misfire code fix or catalyst damage may occur
no more damage can be done if you don't fix air pump
its pollution and emission issue

Jun 29, 2010.