*Choking Issues*

[Goldie_7]

My FD\'s all ready to go after a long re-shelling effort. Had her out for a good test run last night and found she\'s kinda stuttering/choking when I give it flat out and it reaches about 6k revs. Pulls like a train in all gears until say 5.5k to 6k revs. Don\'t want to try and rev it past 6k in case any damage is done.
Could this be a grounding problem? I\'ve heard bad earthing can cause limited revving and I\'m not sure I have 100% grounded everything properly.
The reason I suspect this also is that when I took a look under the bonnet after a run and leaned on the strut brace, it was really hot all the way along and not just above the turbo. I\'m pretty sure it never got that hot before!
 I know it might be overboosting or losing boost somewhere but the reason I\'m thinking more grounding is that I\'ve never touched the mapping of the apexi FC and I know it\'s kept the same map and all boost pipes seem pretty secure!
Any info would be much appreciated as it\'s the last little job before she\'s perfect again!

[Goldie_7]

Bearing in mind, I have changed nothing about the engine since it ran perfectly in the other shell.