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Very brief Hesitation when accelerating over 4000rpm

Nick C

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2007 Holden Commodore VE SS-V Manual
I have had a problem with my car briefly hesitating in acceleration above 4000rpm, I doesn’t happen all the time. It happens when I flat foot it and when I very slowly accelerate to 5500rpm.
There is a bang and the engine gives off for a split second and catches back on.
My mechanic said it was my diff, so I got a 2nd hand one put in, so far the bang has gone but the hesitation stays.
It has been 5 months.
Car has 165k with OTR and Dino tune, bigger extractors and full exhaust, pushing 297KW.
 

Voodoo_SV6

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MY12.5 E3 R8 Manual+MY16 VFII SV6+MY11 VE S2 SV6
My guess is something relatively simple, like a spark plug, lead or a semi block injector
 
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