have lost coolent into oil, suspect intake manifold leak? on 2002 Chevrolet Silverado 1500

car has sitting over a year replaced fuel pump used a cheap ignition tester have spark at all plugs, replaced cap and rotor wires and plugs, coil, coolent level drooped enough for light to come on

Asked by for the 2002 Chevrolet Silverado 1500
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pressure test cooling system to determine leak or ck for air buble in cooling