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 #0048 34k miles. 99 Cobra 4V swapped, FTBR IRS swapped, exhaust, tuned by James Gordon.
Just because I give you advice, doesn't mean I know more than you. Its just means I've done more stupid ****.