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Oil pressure sensor

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I have 2008 Malibu 23LSV that recently got motor replaced in and now at idle sometimes the oil pressure drops to zero and throws engine fault but when cruising the oil pressure comes back up and stays consistent to where it needs to be 52-60psi. The oil pressure sensor is brand new and check connections and seem good. Only thing that I can think of is when previous shop pulled motor they didn’t disconnect the connector correctly and it it slightly yanked it off. The connector looks fine but could that be the culprit to losing pressure at idle only sometimes though not all the times. 

I have checked oil levels and all good there. 

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