low idle on start up
low idle on cold start up could be many things. I wonder what the tune shows about startup & cold conditions?? how many miles on the car?
Usually the idle RPM are higher when cold. When the ECT rises the IDLE RPM drops to desired idle RPM (800 for a stock car, sometimes higher for a cammed one).
If the exhaust smells only a few minutes after startup, then the fuel smell and smoke stop, I think it is OK, but its hard to know without looking at your calibration file.
Anyway, if you have no tuning software, you can't do anything about it.
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and it sounds to me like the tuner didn't do a good job on cold starts & with the airflow tables.
WHICH, sometimes is hard to do as its warm outside... so, have a checkup on that
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If an O2 sensor is not properly heated it can't work, so your car must be operating in open loop. They may be the cause of your problems
You can try new O2. You may want to check them first before buying a new set.


