I cleaned my Idle Control Valve in my '83 380 SEL about 2 months ago, and it has done quite well untill a few days ago. How long can I keep doing that before I finally have to replace it?

The reason I ask is that I will be recieving a limited amount of financial aid for college, and I have allocated $400 for my AC PBC unit. I cant guarantee the skill that I would replace the PBC with, but the ICV is quite simple. However, the ICV is ~ $300 from fastlane, more from my local Benz specialist. Which would you do? Replace the ICV, or the AC and clean the ICV? If I get more FinAid than I think, I will do both.

Any thoughts?

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