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Old 06-08-2012, 01:41 PM   #6
1BadAction
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Join Date: Dec 2010
Location: Dallas, TX
Posts: 160
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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1991 2500 Suburban, Black - 454/80E tow monster, soon to go under the knife... Again.
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