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My 91 Vert with about 165,000 miles just few weeks ago had to have the thermowax replaced was doing same thing. Fix the problem. Its located passenger side back throttle body close to fire wall have to remove couple vacuum lines and coolant line sets up in body faces downward has oring around is when you pull in down and out throttle body unit. There a button on bottom thermowax mine was frozen stiff couldn't get it move at all.
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