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There is a heater hose that goes in the left rear back side of the intake manifold that hooks to a quick disconnect fitting, It is common for the fitting to leak antifreeze.

If it is oil that is leaking, then there is a oil sending unit to the right of the distributor that could be leaking oil. There is a long rubber gasket that seals the back of the intake manifold to keep it from leaking oil also. That's all that could be leaking back there. GOOD LUCK.

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12y ago
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Q: What is leaking on top of your 1993 silverado under neath disturber cap?
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