Well, this sucks posted by moxie (SF) on September 16, 2019 at 04:00 PM
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Heat in the cats makes all the difference, especially since the car sat for a while. I assume the 15 minutes of driving was not necessarily spirited driving as well. Continue driving the car until it can get immediately in for the test, retard your ignition timing as well, it will help. I'm all too familiar with this song and dance, but it is doable.