RepairPal Certified shops can diagnose and repair your 2005 Pontiac Grand Am. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
You either go from the top side if you have the necessary combination of tools, swivels and such, or go from underneath. The 3.4L engine is not easy to service so don't be too surprised if it's hard to do.