Ok I did the diode mod to run more boost on my baby everything is fine it did stutter at first but I had the diode in the right way,but that still has me baffled why it stuttered at the beginning I have no idea but its all better now and idles perfctly ok but the problem is that I can hold boost all Ill hold 12 to 13 in first gear and when I get to like 5K rpm the boost drops to like 5 or 4 psi (auto btw) and all the other gears it won't even hit 7 psi the mbc is old and I was thinking that maybe it might be due to it being bad...any one have any ideas on anything else?