CarTalk.com Blogs Car Info Our Show Deals Mechanics Files Vehicle Donation

Oil pressure fluctuation

My oil pressure drops and fluctuates only when in gear and at a stop, once engine is warm. The engine overheated and the heads were cracked so new heads and valves were installed. New wires, plugs,distributor cap rotor. Runs ok over 1.5 rpm 2.9L 6 cyl ford ranger 1989