In Reply to: Re: How to tell if your fuel pressure regulator is posted by Richard V on April 03, 2000 at 21:14:45:
: BTW, the purge valve doe pulsate about 1-2 times a second
: Thanks, Richard V.
I can only suggest that you scrupulously check all vacuum lines for possible leaks. Some of the hoses are just a press fit, and may have hardened with age. Or they may be cracked.
Check that the rubber boot between the air flow meter and the throttle body is not cracked, and is well secured. Check that your dip stick is pushed well home (I think there is an O-ring which you could check). Check the crankcase vent hose. It is also possible there may be a leak at the intake manifold gasket, although I'm not sure how to check that.
Any stray unmetered air can cause drivability problems.
Otherwise, check plugs, distributor cap and rotor, leads, etc.