Hey hey Scotty, thanks for the great channel, I Have a 2009 Kia Optima 4 Dr with 4 cyl engine. i got into the car drove 1 mile to store in 17 degree weather, it has 140k miles btw upon  heading home from store the engine light came on, and then upon light acceleration it clattered almost like an over heating  engine would, i let off and it went away

 i accelerated again but more and it didnt happen, sitting at stop light it idled rough, but light accel and it stumbled a bit and clattered till i gave it more gas,  could this be a faulty fuel injector? if so do yo think maybe a good cleaning will help? and suggestions on replacements, thanks   DJ Nic