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Your problem sounds like have air leakage from air induction system. I suggest you to re-check the gasket of Air Intake Manifold you installled or vacuum hoses for possible air leaking.
The easy way to check it, use Throttle Body or Carburator Spray Cleaner. Just spray around intake manifold where gaskets fitted and observe the idle speed, once the idle change or encrease, definetly there is air leak and you have check the gasket or replce it if necessary.
But if doesn't make change, I suggest you to check Idle Air Control Valve, check connector plug, lines and if you have donor unit try to do test part.
I hope you fix your problem and please update me whatever the result if you dont mind. Thanks
you say it s a vaccumm problem but dont forget a burnt valve that will make it idle up and down too. I have a 1992 honda accord ex and that was my problem. it was idling up and down too.you can have the compression checked to verify this.
Your idle air control valve (IAC) is going out or your coolant level is low. This valve operates on the water temp. There's a 1/4 water line that goes to this valve. If the water level is low, the valve doesn't know what to do.