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Hello: Have you removed the #7 sparkplug to see if it shows and damage to it? Thanks, ***** *****
Good to hear this, It sounds like there was water on the #7 spark-plug (reason for the code p307, misfire #7 cylinder) Then What happened is the water dissipated from spark-plug and cylinder, Then computer no longer saw a misfire, so it turned off the check engine light! Thank-you, Have a happy New Years!
There is a very good chance that when water entered into the cylinders,it becomes compressed, causing the spark-plug gap to close-up, You should remove at least the #7 plug and inspect for damage (as cheep as they are I would replace them) In many cases the water can damage the firing area of the plug, and the electrode of the plug! Thanks
Sounds good, Thank-you!