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When did this problem start? How many times have you fueled up since it started? Did you scan for DTCs? Has California gotten the 15% ethanol blend that The Big Guy has authorized?
 

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That is a crazy problem. If the fuel quality at your gas station hasn’t changed, and the fuel trims look normal, then I’m completely stumped! Maybe take the JB4 off and see how she does?
 

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I’m stumped. Maybe someone else here can help?
 
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