I think the basic concept is.. if there's a vacum leak somewhere it'll suck up the brake clean which is flamable, so the idle will surge a bit..... though if it's a big enough leak you'll hear it... so if you spray certain strategic areas you'll be able to find the general area of the leak and then find it and plug it... it may not be a leak at allo, but for the 25 cents worth of brake clean, it's a good start
-as
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'89 GT Convertible:
TFS TW Heads, TFS Street Intake, TFS Stage 1 Cam, FMS 1.6 RRs, 24# Injectors, Pro-M 75mm MAF, No Name CAI, 3.73s, O/R H-Pipe, FlowMasters, AOD w/ Trans-Go Shift Kit
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