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iTrader: (3)

Hey guys. I am having a problem. My car starts breaking up under wot around 6krpm some times sooner. I thought It had been my tune so I retarded timing back to stock...still have the problem. Car seems to be holding consistent boost pressure. I checked my inter cooler connectors and they seem fine. I am thinking it may be spark plugs but I haven't gotten the chance to check. I would like your guys input on this as my knowledge is limited. oh also no check engine lights have come on and in data logging it shows up to 5 accounts of knock. Thanks guys for your help and info.