u/BootReady

I have a 1992 Ford Ranger XLT with a V6. It had a bad misfire and was running rough, i replaced the spark plug cables and it started right back up. Drove it to the gym, to the store and home with no issues running great. I get up this morning and its doing the exact same thing. Rough, low idle, not able to get full power. What could this be? Im confused as absolutely nothing changed between when i parked the truck last night, and this morning.