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There's several things it can be ?????

The -4 can cause some headaches as you tune up to larger stages, as well as the other lines involved ?? Pressure drops suck !!! ;)

Not knowing how much tuning you did in the past tune up, did you take out to much timing ?? Did the tune up get fuel rich on you ??

There's multiple things it can be, hope this gets the ball rollin.. SJ
 
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