RepairPal Certified shops can diagnose and repair your 1999 Isuzu Trooper. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
You will want to get a repair manual for this repair, there's just too many things to note, and you can get a repair manual for around $20 - $25.00 online. Try chiltondiy.com or alldatadiy.com