Running fine, hour later wouldn't start?

[SmokinSuperSport]

Oh yeah and I forgot to mention Opti failure doesn't always throw a SES light at least on the OBD1 car, not to sure if OBD2 cars are more sensitive to Opti failure though. Check your coil and ICM like the others said because they are cheaper to replace then the opti. I'd still defintely have the SES light fixed so your more aware of future issues too.