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Re: 91 Suburban Cruise control question
It sounds like a vacuum issue, check valve or leaking hose. Possibly a bad servo, but they seem to hold up fairly well. Another possibility is the actuator to throttle body linkage, if it's not adjusted correctly the servo will not have enough throw to hold at higher speeds.
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2010 Basalt Black Porsche Cayenne GTS - Daily driver
1991 2500 Suburban, Black - 454/80E tow monster, soon to go under the knife... Again. 
1979 16' Action Marine/"Johnny Cash" Merc Bridgeport Champ Motor - Metalflake Maniac
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