[jcp123]

Might start with just a couple of basics. If the injector harness is accessible, pull the connectors from the injectors one at a time and see if you get any cylinders that drop more than others. Compression test would be stellar too. I wasn't clear as to whether you merely checked for spark, or inspected the plugs? If you didn't do the latter, pull the plugs, just because you're getting spark to the plugs doesn't mean they're good (trust me, I know). When you tested spark, did it jump a nice big air gap? Are you able to test fuel pressure? If so, prime the pump then watch to see if it bleeds down pressure, indicating a sticky injector which could cause the rich smell (of course, a misfire would do that too). That's my basics for the moment, enginewise.

For the pulling under braking, first thing that comes to mind is making sure the caliper slide pins are lubed and that the pad hardware is allowing the pad to make contact with the rotor nice and square. For some reason, even many techs don't take care of that stuff despite brakes being a rather crucial thing...