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Over the last 75k, can you tell me all the repairs you have done?
Do you have another post open already that I was helping you on?
When you you have a leaking injector the smell would be from the exhaust and possibly some black smoke that would last about 1-3 seconds.
The K/N is fine, just blot off some of the excess oil since it can effect the reading of the MAF sensor when oil gets on it.
Your right on the cut off, does yours have the electronic or cable driven throttle body?
At operating temp what is the idle speed?
Thats great, keep me in the loop.
Since throttle application helps, I would replace the idle air control valve.
Try gripping the bolt using vice grips or use a die grinder to cut a slot into it and use a flat head screwdriver.
The IAC and throttle body just control the air into the engine, they effect the way the computer adjusts the fuel based on the O2 sensor readings. Does this long crank happen when the engine is cold or hot or both?
My next steps would be monitoring the fuel pressure to make sure it is rising fast enough before the key gets to the start position. Verify the plugs are not older than 70k, then have an injector flow test ran to see if one or more injectors are bleeding down and flooding the engine while off.