sounds like delivery valve seals. i did this about a month ago. this requires a special socket, dv seals, and possibly copper crush washers. theres a bunch of threads on this and one very good DIY in the tech section for a 2.5 diesel engine, but the procedure should be the same. 2 of mine were leaking, so i replaced them all. my mpg and acceleration issues were dramatically improved b/c of it
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