1989 Honda Accord low idle problems, wants to stall in idle?

I have a carbureted 1989 Honda Accord LX 2.0, automatic, with no air conditioning. It runs extremely well for 90% of the time. But intermittently it will idle at a very low speed and start to shutter and want to stall when idling. If I put it in neutral, it will bring up the idling speed enough to where it won't stall. This will happen once every so often and usually if I leave it until the next day, it's back to running just fine. We have changed the vacuum advance, spark plugs, and air filter. And the mechanic said that both fuel filters were fine. If anyone has any ideas or advice, it would be appreciated. I wonder if its a carburetor problem?

Check your engine timing or your AIC valve.

Will do. Was planning to check engine timing but the weather has been just awful and I don't have a garage. I also think that the thermostat is sticking open because the temp gauge rarely warms up.

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