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 May 11, 2016

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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

Can't get an emissions test due to faulty plug

Hi! Since the power fuse was blown and your attempts to install a new fuse causes sparks, it would seem that there is a large draw or short on that power system. First, disconnect the ground cable to the battery...

Gasoline smell in car

You have to first exclude the possibility that the shop somehow spilled gasoline in the interior of the vehicle and/or sat in the car with gas on their clothes or placed any gas contaminated "stuff" (rags) in the vehicle or...

My Nissan Frontier truck is overheating. The smog technician said it needs a new thermostat. Would you like to take a look, give m

Hello, thank you for writing in. If the overheating is only happening when you are at a stop, then you want to focus on the water pump and the cooling fans first. While the thermostat can cause overheating when it...

Related articles

The Best Used Cars to Buy For a Graduation Gift
Your Your little bundle of joy has grown up and on the cusp of entering adulthood. Graduating is a milestone, and you want to reward their hard work and show how proud you are. Buying a used car is a...
Understanding the GMC Oil Life System and Service Indicator Lights
Car symbols, or dashboard lights, are a car service reminder. The GMC Oil Life System indicates when and what service your car needs.
2012 GMC Acadia vs. 2012 Dodge Journey: Which One Should I Buy?
The GMC Acadia is classed as a midsize SUV, which is able to seat between six and seven passengers comfortably. The 2012 Acadia offers three rows of seating, so passengers will feel the roominess that is typical in a true...