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# Vacuum leakage check mounting bolts at carburetor,throttle body and intake manifold for tightness # Fault in fuel or electrical systems # Leaking EGR valve or plugged PCV valve # Air filter clogged # Fuel pump not get enough fuel to carburetor/fuel injectors # Carburetor out of adjustment # Leaking head gasket.Perform compression check # Camshaft lobes worn

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Q: Why does the bronco idle eratic when cold?
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