David, I know this probably won't help and maybe you checked already. I had problems like you described. Rough idle surging, terrible performance, almost dying, etc. Well I realized my intake had came loose. Of course I have the Boss mani, but I ended up having to buy a larger coupler.
I think I'm gonna go to Euless too BTW.
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2011 Mustang GT Premium 6MT: Glass roof, Ford Racing K Springs, Bassani Mufflers, Resonator Delete, Boss 302 IM, JLT CAI, Dallas Mustang Tune, GT500 Spoiler, GT500 Rear Valance, Boss 302 Front Valance w/fogs,302 Splitter, SVE Drift Wheels, Blacked out 5.0 emblems, 5k HIDs, LED Interior and LP Bulbs
GONE, BUT NOT FORGOTTEN
2008 Corvette LS3 A6- Muffler Delete, Full LED Swap, Yellow Fogs
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