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Since it started and ran somewhat OK, any effects from the oil should be gone as far as intake and ignition goes. Since you had the engine off while it was flopped, you could have leaked oil into the cylinders and hydrolocked the engine. It doesn't take much oil to do it. It's possible you bent a valve or a connecting rod. I've never heard of oil collecting below the pistons causing any problems at idle or low rpm, so I wouldn't put that type of damage high on the list of probable problems. I agree that a compression test should be one of your first troubleshooting tests. Before you do that though, do a sanity check and make sure you don't have any ignition wires or vacuum hoses knocked off.

Start with the simple stuff and dig deeper as needed.
 
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