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What's wrong with my Truck?

Source: Yahoo! Answers

I have a 2007 Yukon XL Denali AWD with a 6-speed manual transmission. Every time I hit the gas after a stop or to accelerate during normal driving, the RPM jumps from 1 or 2 to 4 and sometimes 5 suddenly shaking violently then regulates down to the level it should be... Read More

  • If the jump is that crazy, it's most likely the ECU. That's what controls the engine. It receives inputs from the throttle among other things, so it's likely gone a little bonkers. You're still under warranty I'd imagine, so you're golden. Tell them it's too bad they can't recreate it, it's happening, and you paid a... Read More
  • Number 1-You drive the vehicle so a tech can monitor the transmission and get a snap-shot of the data to analyze. 2 The couple I've seen in our shop needed the trans.module or a valve body piece. 3 Your dealer should have a data recorder that you can take with you and when it acts up you push a button on it and it... Read More
  • idk, go to a mechanic

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