Skip the auto shop - Our mechanics make house calls

Q: No power when hot. 1999 Chevrolet Tahoe

asked by on

1999 chevy tahoe 5.7l All new below- Throttle sensor Fuel pressure 60-65 New cap & rotor Plugs n wires Fuel filter Knock sensor

Only when hot I have no power. I have toi feather the gas just to move. At 65 on the high way if I go to pass as soon as it shifts down it bogs down and looses all speed and again I have to feather the gas to get going. Anything more than 5% of the pedal and it bogs down. Again only when its ran for awhile this occurs...While cold it runs perfect.

At a total loss now!!!

My car has 150000 miles.
My car has an automatic transmission.

Hi there, thanks for writing in about your 1999 Chevrolet Tahoe. You mentioned you replaced the throttle sensor, but there are a few different sensors related to this. Assuming you replaced the throttle body sensor and not the throttle position sensor, I would suspect that what you are describing is related to the throttle position sensor. This relays info on the position of your foot on the pedal relative to how much fuel is being introduced into the throttle body. As your foot moves, the computer relays this info to the throttle body and just fuels needs accordingly. If you would like to have this looked at, a certified professional from YourMechanic can come to your car’s location to diagnose the vehicle’s loss of power and let you know what should be done.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Loss of power when in gear. Replaced spark plugs and the same problem continues.

Hi there. If the engine runs great operating in park or neutral, then there may be a problem with the brake system or transmission issue. First check the brakes and see if they are released. Put the vehicle in neutral...

Q: What should I do if the shifter won't change gears?

Hi, thanks for writing in. This is likely a shift linkage issue. There is a small plastic piece on the shift lever that helps to connect the shifting cable to the lever you see inside the vehicle. When these break,...

Q: 89 Chevy 1500 Silverado stalls

First thing you'd want to do is try my video "how to fix the car that idles poorly." A lot of times, just taking the air intake off and cleaning the throttle body will keep it from doing that. If...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...