Highter Than Nornal Idle Due to Vacuum Leak on Chevrolet Blazer

An engine vacuum leak may develop from the throttle body gasket causing a higher than normal idle speed. Failed gaskets should be replaced.

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Average mileage: 171,023 (171,023–171,023)
Engine affected: Gasoline
7 model years affected: 1990, 1991, 1992, 1993, more1994, 1998, 2000
7 people reported this problem
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problem details
1998 Chevrolet Blazer 171,023 mi,
Idle starts high then when placed in Drive it drops as if wants to die out. In coolant there's dirt looks like mud in radiator also looks like muse I checked the engine oil stick and no water or milky coloration what's the problem please help
When im stoping car is acting like it wants to shut off.like not getting enoughfuel. When i accelerate it hesetates and goes