After valve adjustment stall issues.

Thank you all for your suggestions and support. As many said the valves were tight. Set them cold as many suggested and it perked right up, sounds and runs way better. Sorry I didn’t get to you sorry we had gotten almost two feet of snow here (Virginia) and that’s rare in my area!

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Thanks for posting a follow-up/conclusion, there are a bunch of open ended threads out there. Sometimes the OP realizes a "Doh!!" moment & is too embarassed to cop to it. Lol!
We seem to get our crazy snow in Feb./Mar. in SW PA, snows a little every April, & June can give us sub-freezing lows to highs in the '90's!!!!