took my pre facelift classic wagon for a good blast today and noticed at around 5k revs it hesatates then is ok again it only happens when you plant your foot down , if i steadly raise the revs past 5k its ok just wondering if its a fuel pump issue or plugs and coil packs any ideas cheers ..

 

Mine did it mate was a knackered injector was ok till it hit high rev range thought it was det but turned out to be dodgy injector,, could try that may not be in your case but mine did that