Join Date: Sep 2009
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I was having a problem with mine that when I fired it up on the cold days and went to drive off with it, I would hear a hissing noise and it would have loss of power until I got it to downshift, but once the rpms caught back up, it would upshift again and then I would have the hissing sound and loss of power until the engine fully warmed up which would take about 6 miles. I was only having this issue with my truck during the cold months and if temps were above about 55F, I wouldn't have these issues.
I was told it was my exhaust backpressure sensor and I finally got one to fix the problem only to find out that the tubing running from my exhaust backpressure sensor to the right exhaust manifold was missing about a 4" section of tubing. I spliced in a new piece of tubing and it cured my problems.
Not sure if ths will help, but it might be your issue if it is only happening in cold weather.
Also, I have had issues with my truck that if I don't let it warm up for a few, I will have where sometimes it won't move and at times it will even start to flash a code on the shift lever. I then shut it off and restart it and it clears the code. When I have had my active codes checked, they have all gone back to my exhaust backpressure sensor.