If your going to work on your own car, invest in a repair manual. It will pay for itself many times over. Try alldatadiy.com, bentley, chitonpro.com etc.
RepairPal Certified shops can diagnose and repair your 1990 Ford Mustang. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
just tell me how to fix it