When engine is cold, fuel is richer which would be harder to ignite and weak sparks would tend to misfire. After warming up, the same sparks would be easier to ignite as fuesl is leaner and conditions are warmer.
Have the spark plugs and wires cheked out as well.
Our database does not have any information on the ignition coil specification so I am not able to provide you with the part number.
Sunday, December 12th, 2010 AT 2:08 PM