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Most likely one of the belts slipping. My alt/water pump belt did this on start-up and going hard round left hand corners. Check the tension of all your belts, and tighten them. Or maybe replace them if the're looking a bit worn. Hope this is of some help.
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BOSS 5.4lt Quad cam V8 is mine 
MkI BA XR8 with SS inductions, BMC air filter, Herrods Air Injection, Pacemaker extractors and cats back exhaust.
NQ Performance Ford Club Member
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