Information link for high HC causes: https://www.smogtips.com/failed-high-hydrocarbons-HC.cfm

I recommend starting with a compression test first, it's a low cost test and will help verify the...

http://gearhead-efi.com/Fuel-Injection/showthread.php?7426-Serv-No-16196396&highlight=16196396

OBD1 Scanning/Datalogging.. '94 TBI, 5-speed manual. (gearhead-efi.com)

:welcome:

TunerPro RT is a good option for OBD1

http://www.tunerpro.net/

https://www.youtube.com/watch?v=rLRnRNapRN4

dave w