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

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1 answer
pressure test cooling system to determine leak or ck for air buble in cooling