Rep Power: 0

My 2001 has low oil pressure at idle, with the light flickering after the engine has warned up and is idling. Light goes off if I push down the pedal a little bit. As I understand this could either be a bad oil pump or the screen filter on the oil pickup tube could be partially clogged. In order to clean this screen I would have to remove the oil pan. Should I first try cleaning the screen?

 
Rep Power: 119

First you should check oil level.
Second you should check the oil level.

Third, consider the oil filter suspect and just replace it.

With a rag and flashlight and safety goggles and with the engine running, slowly unscrew the oil filler cap and look to see how much oil is in there. Should be a good bit, some splashes out, but should not pour out.

If everything still seems right, get a loaner oil pressure gauge and unscrew the oil sender to hook up the gauge and get real readings.