My friend drives a 1999 Infinity I30 w/133k miles, and we took his car to autozone to see what the check engine light is. Its comming up as misfire in cylinder #4 and I think another codethat is caused by the misfire. We put in all new sparkplugs. We think we should replace the ignition coil next. Where is the cheapest place to order one?
Thanks.

 

replace the coilpack on cylinder 4 then. It just pinned it down for you. Cylinder.