Dyno'd my 1996 cobra- need help deciphering results

[93GTDIN]

Okay here's the background info. I am unable to runa nything quicker than a 14.1 with no MPH better than 100. Pretty poor numbers given the car: 1996 Cobra.

Mods:
BBK O/R H pipe
Pro-Flo catback
K&N filter
3.73's
Tri-AX
C&L Radiator
Wheels/Tires



Notice the intense breakup after 5 K. The car feels like it has spark blowout or perhaps the computer is pulling timing. I'm trying to figure out what is going on, cause 266 RWHP is waaaay low for a cobra with O/R exhaust. I was expecting at least 280 rwhp, but that number doesnt bother me. Its the fact that power drops off after 5,500 and fluctuates so badly. You could actually hear the car making noises corresponding to the dyno graph.

Kinda sounds like a miss.

Any help or experience at all is greatly appreciated. I want to hear everybodies thoughts.