Had these symptoms with a leaking intake manifold and bent intake valve.
Replaced the intake boot and off idle improved.
Ported head and found the real problem a slightly bent intake valve causing hard start and running concern.
Could get it to start but if I opened the throttle slowley it would die and was hard to get started.
I found before the valve was fixed that if you would flat foot the throttle it would take off but ran like junk untill warm and still ran like junk.
I hope this will help.
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