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First thing I would look for is a loose vacuum line to the engine, sucking in the extra air. If the brakes feel "hard", look on the brake booster (the big round thing that the master cylinder is attached to) for a disconnected vacuum source line.

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Q: Why might a 1999 Chevy venture accelerate on its own making it difficult to stop with recently replaced brakes and then idle very high when put in park?
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