I would have the car looked at by a speed shop/Mustang specialty shop in your area. The car should be making 400 HP - easily, probably more.
With the spiked graph, maybe you are losing spark? The blower could be "blowing" out the spark. What are you plugs gapped at? For a blower car, .035 is a good place to start.
Ok, here are some basic questions (you've probably been through these before, but...):
1) Is the JMS chip "aware" of the blower (i.e. is it specially calibrated/programmed for the blower?)
2) Is your Pro-M calibrated for the injectors?
3) All clamps on tightly?
4) Is the blower belt slipping? Is the belt on tight enough?
5) Have you had a general code scan? Any codes?
6) May want to check the O2 sensors - could be bad.
Just some ideas. I hope you get it worked out.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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