Just had tuneup on my 2008 Honda Fit. Replaced one coil pack. New plugs. Has 79k miles. Runs fine when cold but as soon as it warms up, it starts to miss every 2 to 3 seconds. Took it back to servicing Center and they put injection cleaner in gas tank and told me to drive it. No check engine light. Still misses when warmed up. Anybody have a solution?

 

that's one ignition coil down; three to go.

 

4 coils, 4 plugs ,, adjust the valves.. Repeat every 60K and life is good.