My 1989 4Runner is experiencing some trouble idling on startup when the weather conditions are damp. This has been going on for the last 2 days. Rain rain go away already!
I have to give it throttle to get it to maintain idle. This goes away after about a minute of warmup time.

Any ideas on what to check?????

My first thought was clogged cold start injector, or damp rotor.

 

I would check those and inspect the distributor cap and plug wires for cracks/breaks too.