thanks for the advise Greg and everyone. Yes, the walnut sized tank vent (“control valve” I think ) leaked vacuum and is gone (not thrown away). The plastic tank vent vacuum valve on the pass side of the engine is new and holds vacuum. I’ve just rerouted the output of the plastic tank vent valve direct to the side of the air filter housing because I’m not replacing the $700 walnut sized control valve. But I’m already having second thoughts about that reroute. Not sure what to do in absence of the $700 walnut sized tank vent valve. Ideas on this ?
the throttle body is back out after all this and I’ve decided to replace the top end (still supple) breather hoses and throttle body/MAF orings so I won’t have worry about them for a about a decade.
In any event, I was hasty in worrying about the rebuilt MAF.