Quote:
Originally Posted by m5james
OP needs to flash back to stock and see if the same problem exists and/or search for the Reduced power warning thread on here where it can be anything from a boost sensor (a code I received) but was ultimately fixed by replacing the vacuum lines. I myself resolved my post tune & JB4 high boost/misfire issues by going to colder plugs with tighter gaps...it's a freaking monster at 20psi!!
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oh those NGK's listed in your sig are a colder heat range plug?
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2011 BMX X5 Xdrive50i - 127K - No muffler, BMS Stage 1
2005 Jeep Grand Cherokee 5.7L V8-Her stock DD
1995 Ford Thunderbird 4.6 V8 LX - A bunch of mods BMW guys don't care about
1995 BMW 540i6 - H&R Lowering Springs, Bilstein's, Racing Dynamics Bars, Catback, Short shifter