TazVet

I've noticed the same problem with my 2007 Silverado LT Ext. Cab 5.3L with 109,000 miles. At high RPM pressure is over 40lb, but at a idle at at stop light it drops to around 20lb or lower. When you get on it pressure goes way up. Doesn't make any noise at anytime. I think I'll try changing the oil pressure switch screen, seems like that's the culprit and it's the cheapest fix.