So today I comp tested my truck on cylinder 3 (The 0psi one) with my truck running, if I slowly give the truck throttle it will peak at around 30 psi, if I go from idle and snap the throttle wide open, it will hit 150 psi and then drop down when the engine planes out, so if I take truck and I drive down the road, and I hold it Wide open in like 3rd gear, bogging the engine, theoretically it would start to hit 150 psi at about 2500-3000 rpm and then if i were to let the trottle off so then the truck is just cruising i would run a much lower compression, correct? Is this still pointing at my valves being my issue or could it be a head gasket issue?