Rough idle on start

[hqhutch]

I just changed the coil pack on cylinder 1 on my 2002 V70 2.4 NA auto. It ran perfectly after I changed the coil pack yesterday but when I cranked it today, rpm shot almost instantly to 2000rpm and bounced around from 1000rpm to 2000rpm. It only did this while in park. What could cause this and how do I fix it?

[Swedespeed96]

Sounds like a possible vacuum leak, is it throwing a check engine light ?