Ok I have a blacktop sr20 that started hesitating on me recently. Drove perfect for a while now around 2-2500 rpms it hesitates before jumping back into boost. I've checked for vacuum leaks and found one but it made no change. Changed the spark plugs (possibly gapped wrong at .02 and fuel filter. Timing may be off too. The top guide rubs a little at certain rpms (new tensioner?). Any suggestions would be appreciated. Mods are - je pistons, bc rods, apexi head gasket, bc titanium springs and retainers, bc stage 2 cams, and Greddy fmic. Thanks