S14a flatspot

[franmk]

had the same exact same problem with mine.
sent it to richard bradley turns out the car was running lean, he sorted it and it made a big difference

[PeterT]

I had this before, changed pumP and fuel filter and voila. But every car is differant

[will_c]

fuel pump
fuel filter (sure stick a z32 in there)
boost leak
afm dirty (easy to clean, remove and clean carefully with throttle body cleaner, DONT touch the wire!)
plugs, as robbie said smaller gap