WHAT VEHICLE? The 1990 GMC Sierra 5.7L Automatic in your signature, or something else?
I wouldn't know TunerPro from Tina Turner.
"Smelling rich" is nearly always some amount of misfire, coupled to a failed (poisoned, melted, broken, "murdered") catalytic converter. Actual "rich" running has to be enormously rich to produce "rich smell". Any reasonable amount of "richness" drives the CO sky-high, but CO is colorless and odorless. No funny smell.
More evidence of misfire.
Misfire is generally interpreted by the O2 sensor as a false-lean condition, leading to additional fuel added via the fuel trims. Even so, the "rich smell" is usually evidence of the misfire, not the added fuel.
What is the fuel pressure during the prime cycle? What is the fuel pressure during high-demand use?
Verify ALL the "tune-up" items--initial timing, cap, rotor, plug wires, plugs, PCV system, EGR system, charcoal canister, heated-air intake.
Verify ALL the sensors especially O2 but all the rest in general; and computer outputs--short- and long-term fuel trims, electronic timing advance, IAC, EGR solenoid, AIR diversion if used, etc.
Make sure the outlet of the catalyst is hotter than the inlet. If not, expect to replace the catalyst AFTER you get the engine running properly otherwise.