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this may not be your case but is worth mentioning. Knock sensors are sooooo sensitive that you may not hear audible knock (if you do it's prob too late anyways).. Being that each cyliner has individual sensors, timing can be pulled from one cylinder and you wouldn't realize it. there is also "phantom" knock which can be caused by harmonics that acutally give the knock sensors a false reading and cause the symptoms mentioned. My first start would be the simple things; plugs, injectors, take a look at the fuel pump and filter.. You really need to do some datalogging to see what is going on as everything is just speculation at this point
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