Oil pump snoise at 1000 rpm

As far as the oil light on at idle an going off with more rpm's , worn engine bearings , oil pump ! How many miles on it ? P1870 Chevrolet Transmission Component Slipping Look's like you need a new vehicle !

The oil pressure light coming on at idle is not a big worry, so long as it goes out as soon as revs rise.. First step is to remove the oil pressure sender unit and screw in an oil pressure gauge. a mechanic can do this for you. This will tell you if the sender is faulty (common enough) or the oil pressure is low. A rule of thumb is to have about 10 psi per 1000 RPM in the normal rev range

If it is indeed low, possible causes are
- worn big end or main bearings (the car is old enough)
-faulty or weak over-pressure relief valve in oil pump
-worn or faulty oil pump
-blocked or sludged up oil passages
-blocked or sludged up oil pickup strainer mesh in sump

Some of these can be investigated by putting the car on a hoist and removing the sump
.
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1996
Hmmmm
20 years old.
Could be it's just getting tired, as in worn components.
As long as you're getting adequate pressure at operating RPM it should not be a major concern.
If you're not using 15W 40 I would suggest doing so.
Cheers.

could also be wrong type of oil but worst case is the big end bearings inside the engine have gotten to big to maintain oil pressure and as you guessed the oil pump could be worn out, i would try changing oil pump first.

Get an oil change first. If this does not fix the problem then you may need to replace the oil pump.

Make sure the oil level is correct. If the engine bearings are getting worn, the oil pump is worn or it's screen plugged, that can cause low-RPM weak oil pressure. Try running with 'high mileage' oil at your next oil change and always replace the filter. At some point, you may need to consider overhauling or replacing the engine. Good luck!

Probably the engine bearings are getting a little worn. Using 10/40 instead of 10/30 oil will improve idle oil pressure as will replacing the oil pump and cleaning the intake screen. Make sure the idle speed is set correctly.

bad to worn out oil pump or excessive oil passage clearances that allowing more oil to pass thru them at a lower pressure due to the bigger opening. It can be a sign of an emminant engine failure due to oil starvation.

could be a clogged oil pump pick up screen inside oil pan,or could be worn maine bearings deep inside lower engine block.It also could be a weak oil pump as well.If you take it apart,check your main bearings for excessive wear.hope this helps