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What you describe sounds like failed or failing cam phasers of valve timing actuators. Most of the dealers will just recommend a replacement engine when they start to fail because of the cost of replacing the timing chain if it is faulty as well. I would probably try replacing the cam actuator solenoids first. They are shown in this illustration as variable cam timing solenoids and are fairly easy to replace. I attached diagrams to show replacement as well.
If replacing the actuators doesn't do any good then you probably would be better off replacing the entire engine. I hate to say it, but it would make more sense in the long run than replacing the timing components.
Also, check the oil for metal content. Wipe the dipstick with your finger and hold it in bright sunlight. If you see sparkles and gray metal then the engine is most likely finished.
I just wanted to see if you need more help. Please don't forget to rate.
Please let me know if you need any additional information. Don't forget to rate (that's how we experts get paid).
Let me know if you need any additional info.
Please don't forget to rate. They don't pay us if we don't get a positive rating.