my oil gauge reads low pressure at idle,then loss of ecceleration whatcould caus on 1995 Pontiac Bonneville

switched out starter,sonds like its siezed but its not

Asked by for the 1995 Pontiac Bonneville
you may have then beginning of an eng siezing up. can you turn motor over witha socket on crankshaft bolt?
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does the motor turn??

it tries 2 but not fully over i was told it might b a timing belt is there a way i could check without taking the cover off
3.8L engine is pushrod with chain , not belt. What condition is battery and ALL connections and wires? Has starter been tested for excessive draw? Mass air flow meter checked for restrictions/leaks in intake for loss of power issue?