Bad idle and back sooty plugs

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94 Mazda 626, 2.0, standard. Installed a used throttle body and idle air control valve, new plugs and wires, o2 sensor, fuel filter, air filter, distributor cap and button. I took apart the IAC and cleaned it. I'm pretty dog gone sure the springs and etc are correct. When I try to start it, it only starts on second and third try and I have to pump the petal several times for 5 seconds plus to get it to idle. It has hesitation when petal is pushed. Biggest thing I noticed was a strong smell of gas/fumes out the tail pipe but after 1 hour of trying to adjust timing by ear the new plugs and o2 sensor is covered in black powdery soot. I also noticed that when I put pressure on the throttle-spring on the throttle body where the cable goes in the opposite direction ( as in thing to close it more the car seems like it will idle better. What could be the problem and what steps do I need to take to start eliminating and checking the problem. Thank you