If I think it is the check valve I turn the key to run and back to off a few times activating the 2 second pump run to prime it and see if that fixes it.
If that does not due it I would next check the spark plugs to see if they appear old or if you are in the cold to make sure they are not 7's. The 7's work fine in the summer or in modified cars but in the cold they can make it difficult to start.
Another thing I might look into would be carbon build up. You can see the top of a piston or 2 usually when the plugs are out so if they are cruddy they could be absorbing the initial fuel. But you cannot easily see the top side of the intake valves. So some sort of induction flush you can take care of that. I usually change plugs after the induction flush as good practice. If you wanted to just try a fuel additive to clean the valves I would recommend BG's 44k. Put it in a full tank of gas and it will do a good job by the end of the tank cleaning off the valves. When my boss was working at Audi in the early 90's and they were having a big problem with carbon build up on valves they would remove the intake manifold and walnut/media blast the intake valves to clean them. They had a customer run 2 tanks of gas with the 44k and then they pulled the intake and the valves were clean. Good Luck, Bernie
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