Hi there,
Thank you for the donation,
I would be thinking that you will have a sticky hydraulic valve lifter, as you mentioned all the muck in the engine, this can lead to lifter problems, what you can try is getting a quality engine flush and run it through the engine, see container for details, change the filter and look for a NULON product called lifter free, I think that is what it is called, this will also help with the lifter noise as well, start here.
Mark (mhpautos)
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Friday, October 15th, 2010 AT 1:09 AM