Skip the auto shop - Our mechanics make house calls

Q: hello i have a 2000 sierra 5.3 idling high and tranny shifts when its idling high seems like it does it when its warmer weather tu

asked by on

hello i have a 2000 sierra 5.3 idling high and tranny shifts when its idling high seems like it does it when its warmer weather tu

My car has 154000 miles.
My car has an automatic transmission.

If I am understanding your question correctly, it sounds like the engine is idling high, but I don’t understand the transmission issue you’re having. The high idle is most likely an intake manifold vacuum leak at the gasket O-rings. This is pretty common and would require the engine intake to be removed to fix it. The idle air valve is another possibility and would require the computer be tested to see if this is the cause. I would recommend having a mechanic, like one from YourMechanic, come out and diagnose the high idle and and transmission issue you are having.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. hello i have a 2000 sierra 5.3 idling high and tranny shifts when its idling high seems like it does it when its warmer weather tu

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Window controls not functioning properly.

This is most likely the result of a failed power window motor or regulator. The regulator is a scissor-type lift that moves the window up and down when powered by the motor. A professional, such as one form YourMechanic, can...

Q: Wheel is free but the key won't turn

You should try a different key if you have a spare one to try. If the spare key turns the ignition now then the original key is worn and needs replaced.If you do not have an extra key then look...

Q: Ran out of gas, now my car won't stay running.

We can start by assuming the issue is related to spark, fuel, or air. If attributed to fuel, it will be a clogged or weak fuel pump. If the vehicle ran out of gas when this started, you may have...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.