98 dodge stratus misfire

I am wondering if anyone has any advice on a 98 dodge stratus that continues to misfire only in the summer time? I have changed the spark plugs and wires with no avail. The check engine light will come on and just say multiple misfires. It runs great in the winter. During the summer months it constantly misfires and acts like it wants to die when it is really hot out. Any advice anyone has would be greatly appreciated!

check the ignition coils for hairline cracks. If there are cracks, replace them.