Either DIY or take the computer to a repair shop that'll put new capacitors in. A JY computer is a crapshoot at the age these things are and you might have an OEM piece fail on that one too. You can get rebuilt A9L/A9M/A9P computers from Autozone I believe. At least the A9L you can but you need the P if you are an auto sooo...
2000 Mustang GT Steeda build #48. Bolt ons, suspension, Novi 2000.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.