Yea C2, we need to see a scan of this. Ive helped a few 3800 guys with bogging and it has been, 9 times out of 10, timing too low in cruise. I have no idea if the shifts are set up right first off. If its shifting in the right places, then we need to see timing tables. If those are good then it's time to look at the sensors like you said there.
You are probably right though man, if the tune is set properly that would be the first place to look, then if its not the TPS the Crank Position Sensor seems to be the next place to look as of late....
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A SS looks like it could kick your ass if it wanted to, but a WS6 looks like it's coming over to do it
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