Help me dignose please.

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Bill
I checked the choke plate and it is fully opened when warm.
Not sure what you mean on the pcv valve are you talking about the plug the pcv valve goes into ?
Good that the problem went away, and maybe you did something to fix it. Cars are like that.

My point on the PCV is that even a few drops of oil getting sucked thru the PCV valve into the intake can make clouds of smoke. Aftermarket valve covers can cause problems since many don't have a baffle under the PCV port to block flinging oil drops. One needs to get the correct rubber insert that has a built-in baffle, and of course rubber degrades over time.
 
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