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Originally Posted by soundrew
I would check for vaccum leaks-- a likely cause of erratic idle. What did your old plugs look like? What color were they? Were they all the same?
When RPMs get that low (750), oil pressure will drop significantly. Remember, your oil pump is driven by the engine so it will vary depending upon RPMs. It should show at least 50psi when you are at speed (3000 RPM).
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I was thinking dirty fuel injectors?
My oil pressure gets pretty low when I notice the erratic idle, however at cruising speeds (70 mph) it's usually at or above 50 psi. The old plugs were needing to be changed and there were a couple that looked unevenly worn. I changed those and the wires though.