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The fact that you are getting hesitation and popping especially at start indicates it is most likely running way too rich. Too much fuel can also cause a misfire or hesitation. When the car starts it is programmed to run rich (starts at like .78 lambda) So if your tune is off it could be running in the .6's or lower which will cause you misfires and backfires.

Also if you have cats, they will be destroyed in time from this.
 
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