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Came across this years ago:
"lack of the oxygen sensor is the most likely culprit. if all else fails, unplug one injector and go thru on 5 cylinders. that cylinder now acts as an airpump and the emissions will be noticeably reduced. on engines with a low compression cylinder, which can cause high HC, unplug that injector. on CIS cars, braze up the tip of an extra injector. on carb cars, plug a mainjet with a round toothpick and break it off. you didn't read this."
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"There is nothing to be learned from the second kick of a mule" - Mark Twain
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