strange power loss

[97gstnick]

ok, this one has got me stumped. i have a 50 trim and 750cc fic, walbro 255 and aero afpr. heres the thing.... car hits boost hard at 4000 and then when i get to 4500 it misfires. i can creep it past 4500 but if i give it a little more gas it will misfire . i cant make any power above 4500.

 

[99gst_racer]

What are you tuning with?

 

[95AWD_TSI_TALON]

Try to things. One check your plug gap...by now you should be running bpr7es's and gapped around .028" If your gap is bigger you will blow out the spark. Another thing is pop your hood at night and look at your spark plug wires. If they are bad/ arcing you will see a neat,faint light show between them and your VC.
Matthew

Ps- I have gone through 3 sets of magnacores.....Check them even if they are not that old.