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yea the guys from undercover performance tuned the car but i never got a dyno sheet and i just recently brought the car, the car runs great when im not at idle... only if i pop it into neutral and let it roll to a stop it will dip down to under 500 rpm and just die, ive already checked for air leaks their are none, previously the spark plugs were gaped to .016 and it was horrible horrible horrible, but after i gaped them to 0.024 it ran much better, but the issue is still their. how would i go about checking if the wide-band is on its way out?