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RPM dipping at idle 200 1993

I recently changed out the air box on my 93 240 with 176k miles. The box probably didn't need to be replaced but it was melted on one side from an old leaky battery. I also topped off the coolant.

There's a possibility that I overfilled the coolant resevoir because it isn't level and I couldn't really see where the fluid level was.

The problem: At idle, especially when braking, the rpm "bounces" around 1000, sometimes hitting around 500 and even sometimes stalling.

Any ideas?






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