The fuel pressure regulator has a rubber diaphram that will crack with old age. Easy to check, the FPR has a vacuum hose that runs across the manifold and to the vacuum tree. Pull the hose off the vacuum tree and sniff it for gasoline, if you smell any or a little dribbles out, get a new FPR.

When my FPR died, it took a while to get the engine started and then at engine start, a puff of black smoke came out of the tail pipe. Much too rich.

As for a high idle, there is an air leak into the manifold. Check all vacuum elbows. Check the air hose from the filter to the throttle body for cracks. Low vacuum pressure will also cause the engine to run rich. A clogged PCV or EGR won't make the condition any better!
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Keeping it running is better than buying new