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2007 Outback PO301,PO302,PO303, Just replaced head gaskets


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Hello, I could use some help please. My 2007 Outback 2.5I overheated  due to head gasket leaking compression into cooling system. I did everything the right way, I had the heads machined flat and used Subaru parts to reassemble. Upon initial start up it ran rough which is not a surprise. It had a rough idle and stumbled with throttle. Then CEL came on so I scanned it. That's when all the misfire codes came up. I cleared them out it ran perfect for a day until just now. Cold engine after work and the scenario repeated exactly. I cleared codes and drove home with no further issue. I reused my plugs and wires since they only had 15,000 miles and looked fine, And yes they are NGK . And this issue never happened before the cooling issue. Any help is appreciated, thanks.

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