Quote:
Originally Posted by OsoMoore
I'm not an expert on CIS, but I believe at higher RPMs your vacuum is greater, so if there is a small leak, you'll get more leakage and things will get worse.
Also, there are a bunch of components that change size/behavior at different temperatures. So those could explain why the system changes behavior over time.
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My experience with vacuum leaks tends to be that they are the most obvious at idle (when vacuum is high and air flow is low) and smooth out at higher RPMs.
Tirwin's comment has me wondering if it could be the frequency valve itself. I'm not coming up with anything else electrical that could affect mixture at higher RPMs.