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I am new to this forum, so if this is in the wrong place, please direct me to the right one. I will be very thankful. So I have 2 04 excursions with the 6.0. My 4wd is having shifting issues at normal temps. When the engine is cold or barely warm, you can give it a lot of throttle and it will shift properly. Once warmed up, if you gently accelerate it will shift fine. If you try to accelerate quickly, it will rev to 1800-2000 rpms and stay there. If you continue to try to accelerate, the blow off valve opens and you can hear the bub bub bub of the turbo over boasting. If you let off the throttle just slightly it will upshift. I am at a loss. Please help..thanks
 

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Does the Tow/Haul light flash? Is the Check Engine light on?
 
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