can a bad battery make a car idle rough I have 2000 honda accord v6 with 140k miles and which is very well maintained and runs really nicely. however, every once in a while when i start it it would do some Welcome to the toyota nation forum : toyota car and truck forums. I have 2000 honda accord v6 with 140k miles and which is very well maintained and runs really nicely. however, every once in a while when i start it it would do some Please, help the diagnostic test shows 4 misfires and an idle control problem. is it possible that all the 4 cylinders can have a misfire or there might be another ...