I have a 99 kia sephia. The check engine code is showing miss on#3 cyclindar. It will hardly idle goes dead at red lights. I changed the coil pak, plug and plug wire. Reset the computer and the same problem remains. Check engine light came back on says same message. I filled the car up with gas yestereday and put in some fuel injector cleaner. Today I drove it a total of 55 miles and it had burned a half a tank. I am not sure what else to do at this point. You cannot pull off from a stop light with the AC on and have to manually shift because it is running so rough. Any ideas what to check next and how to confirm if it is the injector. someone told me to put a can of seafoam in it, but I want to make sure it will not do any damage to this year kia. Thanks for any help. I bought the kia from original owner in 2009 it had only 67000 miles. I have all maintenance records it was kept up according factory specs and all recall work was done on time. As of today it still only has 83000 miles on it.
Falethea
Falethea