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Well after a good run, it seems the truck is fighting a Cylinder 7 misfire that came up today. I think my son hasn't been diligent enough with monitoring oil levels based on the fact it was 1.5 quarts high and there is a p0521to be  2011 CHEVROLET Silverado 5.3L V8 3GCPKSE3XBG305530 Odometer: 257,790 mile P0307 Cylinder 7 Misfire Detected P0420 Catalyst System Efficiency Below Threshold Bank 1 P0521 Engine Oil Pressure Sensor/Switch 'A' Range/Performance I'm noticing a sporadic tapping metallic noise at idle, where do I go from here? Thinking of pulling the valve cover an taking a look. I'm guessing broken push rod, lifter, or rocker arm. What is worst case scenario? What is best case scenario?

2013 GMC Sierra 1500. Currently at the dealership: SCAN AND FOUND P0304. CHECK AND FOUND IGNITION COIL FIRING. CHECK AND FOUND NO COMPRESSION ON #4. REMOVED VALVE COVER AND FOUND BENT INTAKE PUSH ROD. RECOMMEND ENGINE TEAR DOWN AND INSPECTION FOR LIFTER/CAMSHAFT DAMAGE. $800 Unfortunately, misfire happened on the way to work, so it's probably done 50 miles since it started misfiring. So I'm going to take it home 5 miles and try the lifter release method. Perhaps AFM delete if it comes to that. Would it be better to drive it the 5 miles with: • New pushrod • Bent pushrod • Removed pushrod? Thanks, Bob

Just became a member. I have a #7 Intake collapsed lifter. 2012 5.3 Sierra with Al block. I believe I am looking for the CPR-007 release tool. Is that the one that comes with the VLOM mod kit? If I am understanding correctly based on your videos. By modifying the VLOM it will prevent the AFM from working? I then can send my ECM to LT1 and have the program it to delete this option?