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Q: Car idle is high - 1994 Chevrolet C2500 Suburban

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Hello. It sounds like you have a serious vacuum leak or a fuel pressure regulator leak. I would check all of the hoses for signs of leakage and also the intake manifold gasket. The intake gasket is the most common failure on this engine. If there are no vacuum leaks, then the issue may be a fuel leakage from the regulator. I usually also test the manifold pressure sensor as this sensor is the most common one to fail and cause the same symptoms. If you want to have this looked at, consider YourMechanic, as a certified technician can come to your home or office to diagnose the high idle and proceed with the correct fixes.

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