Missing At 4000rpm

[cattivo_69]

Hey guyz i get a miss at around 4000rpm where it feels like the car is struggling? (r32 rb20det)

Now i used to be able to hear my fuel pump kick in when i turned on the igintion on, could hear it workin for about 5-10 seconds, now recently it only as a short noise... could this be a problem??

also could it be coils? on my last service i put iridium plugs, so hopefully its not them??

any suggestions??

taa Joe