Did you resolve this?
I have exact same issue. Put in the same parts. New Plugs >>>old ones seized in heads as they stick out past head and carbon up or burn. Do this cold!
My vaporiser was choked with oil, diaphram was sutck in bore, But new parts just **** it off, and it's worse. I have not check engine light on, and you need scanner to access codes.
i'm hoping you can let me know if you fixed this before i toss any more parts!!