Driving on the interstate on the way to work this morning, my oil light started to flicker. I immediately pulled over and checked the oil. Oil level was ok and looked fine. Cranked the truck back up and light was off at idle. Under acceleration the light started to flicker again. I searched posts for this and most of the flickering light episodes were at idle. Mine only flickered under acceleration. Is this a sign of an oil pump going bad? (I went and had my oil changed during lunch and on the way home the light never came on). Any thoughts are appreciated.