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Message: [QUOTE="Mickey427, post: 1481527, member: 18050"] It's been awhile since I've worked on pickup but wanted to give an update for others who may experience similar problems. I have put in a new ipr valve with no change. Swapped pcm with known good one and no change. Watched ipr signal on oscilloscope and looked good. Decided to check for airation in the oil by using port on top of oil reservoir to plumb in a valve and clear section of hose. Brought engine up to temp and RPMs where it starts to surge I opened the ball valve. The oil I ran through looked good until I shut the valve off and then the air bubbles in the oil started to come out and noticed 1/4 of the oil volume was air. Now the engine needs to come out to pull pan to find out what's wrong. Figured I'd share my testing method with everyone for future use. Thanx to everyone for the help along the way. Sent from my SM-N900V using Tapatalk [/QUOTE]

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