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Star: My trailblazer 2003 when is running..55 mph

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My trailblazer 2003 when is...
My trailblazer 2003 when is running at 55 mph star to go back and forward suddenly, and I take to a mechanic and put the computer and He says the truck dodent have nothing but still have the problem, What could be the problem
Submitted: 8 years ago.Category: Chevy
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Answered in 9 minutes by:
6/29/2010
Chevy Mechanic: Dan, Technician replied 8 years ago
Dan
Dan, Technician
Category: Chevy
Satisfied Customers: 26,058
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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What do you mean it goes back and fourth? Thanks.
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Customer reply replied 8 years ago
When its drives at 1650 RPM sudenly lows to 1400 RPM in Mexico we call this : SE TIRONEA, I don t know if You understan whta I tray to explain.
Chevy Mechanic: Dan, Technician replied 8 years ago
Ok, it sounds like your torque converter is kicking in and out which is caused by the torque converter solenoid. The problem is most likely that solenoid otherwise the throttle position sensor. let me know if you have questions. Thanks.
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Customer reply replied 8 years ago
But its normal that if puts the computer dosent show that any sensor its bad
Chevy Mechanic: Dan, Technician replied 8 years ago
Yes it is normal for the computer not always to pick up a problem.....Shift it out of overdrive and see if the problem stops if so its the solenoid if not then clean the throttle body which is also a common problem with this vehicle.
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Customer reply replied 8 years ago
I already change the solenoid and clean the throtle body but still the same.
Chevy Mechanic: Dan, Technician replied 8 years ago

At this point you need to have vehicle connect to a scantool when problem happens because it sounds like you may have a engine performance issue and nothing to do with the transmission at all. then depending on what you find from there let me know. thanks.

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