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Re: Errattic idle
It does sounds like a vacum leak somewhere on the engine. The easyest way to find out is to start the trailblazer and let it idle. Take a can of carb. cleaner and spray it around vacum hoses and the where the gaskets are on the throttle body and intake to see if there are any leaks.
If there is a leak the carb. cleaner will instantly make the idle of the engine jump up due to more gas being placed into the system. I have found that this is the fastest and easyest way to find vacum leaks.
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In the end there can be only one.........Chevrolet 
Brad
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