I have an 01 LS1 and lately I have noticed that when I get on it, my oil pressure drops really quickly then shoots back up towards 60 and 80 psi. For instance normal oil pressure is about 40 psi and if i lay into it the gauge will drop to about 20 and then shoot to 60 in a matter of about 1 second....so the drop and climb are really fast. anyone have any idea what is going on?????