Q: How difficult is it to change the oil pump in a 1996 Seville with 4.6 Northstar on 1996 Cadillac Seville SLS

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the computer flashed 'check engine oil', as I have been unemployed, it had been a long time since last change (about 20k). I changed the oil & filter. The same message now comes up and oil level is not low, although about a quart over now... Today the oil light (idiot light) flickered while I was at a stop light; engne was running to the hot side (but not overheated). This car does have an oil cooler also. How "probable" is it that oil pump is bad?
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