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2007 Toyota Sienna came in with misfiring problem and catlytic converter were getting red on both banks. Checked out too much engine oil in the crank case almost more then double. Drained out oil replace engine oil replaced fuel pressure regulater checked engine compression (150psi) on all cylenders, replaced spark plugs, but still not starting and flooding bad.

Anybody have experience wih that kind of problem?

Seems to me that an injector or injectors are either being commanded open or are stuck open. Not 100% sure on this particular one but i think the injector harness breaks out and is assessable, Using a test light that's made for pcm safety probe the connector while cranking. There should be impulse at 6 points.