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Thanks for asking your question. I will try and help you out.
It sounds like you may have an intake valve not sealing. I have seen this before. When this happens there will be a popping noise in the air cleaner. To repair, the head would have to come off and then valve repaired. I am sorry. I wish I had better news.
Please reply back if you need more help or have more questions. I am happy to assist.
Thanks for asking your question. I will try and help you out. This engine has a mechanical valve train. I would definetely check this first. You may have a kid adjustment or bent push tube.
Not common for a turbo to make this noise. Normally when they have a problem. They fail by breaking the shaft or end wheel.
Hey. I just wanted to see how things were going. Please let me know if you need more help. I am happy to assist. If my information was helpful, please leave a good or higher rating so that I receive credit. Thanks.