hesitation at WOT

[brogers at terrix.com]

Guys-
My motor is hesitatin' at WOT. Not always, I don't think - but enough. Motor is stock save for RS2 turbo, EM, and software. Running about 24 psi. 
It's been about 35,000 miles, 7 years since I did a cap and rotor. How long do those last? Could it make sense to replace the cap but not rotor? Plugs are F6DTC - not F5DPOR - they have at most 5000 miles on them. I cannot remember if I've ever done the plug wires...

Thoughts?

TIA-

Brandon
'84 ur-quattro 20Vt