Evening everyone I need your help. I just bought a rebuilt engine for my 94 idi got her all put in the truck and fired her up. She ran great for the first 15 minutes after startup. Oil pressure is perfect and everything seemed to be working just fine. But about 15 minutes in I started to get air blowing back thru the intake. It’s hard to explain. I’ve posted a video to help me diagnose it. Below is the link to Youtube for a short video I made this evening.
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