Quote:
Originally Posted by spdbrake
Meant to ask you when you say "breaking up" @ 5800, you were on a dyno correct? If so the operator most likely/ should have had a O2 sensor on one of your sidepipes. I'd ask him what the AFR changed to at that moment just prior and then @ the breakup. If it leaned out I'd start looking at your fuel supply (Old hoses, filters and the like). Ethanol is not kind to rubber.
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It was leaning out. Car isn't old, and engine had about 1000 miles on it. I had a wide band on the exhaust. Need to get the print off to compare with factory.