Skip the auto shop - Our mechanics make house calls

Q: Sudden RPM drop - 1996 Chevrolet C2500 Suburban

asked by on

When I'm driving at around 50 mph and let go off the gas pedal, the speed remains the same. Then I have to apply the brake and at that point, the RPM would drop as if the vehicle is idling. What might be causing this?

Hello. This is usually caused by a failing throttle body. Over time the throttle plate will wear into the throttle body bore causing it to hang up and not release as it should. I usually check the throttle body for this wear. If it is fine, then it can be the throttle cable binding. If you want to have this looked at, consider YourMechanic, as a certified mechanic can come to your home or office to inspect the systems and perform the necessary repairs.

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: Rough idle when in drive..but idle is fine when in nuetral or park

Hi there. Check for vacuum leaks on the engine. A small leak will cause the engine to stumble when the rpm's are low, like in gear on automatic transmissions. Look around the intake manifold for the gaskets being broken. Check...

Q: Trouble shifting from Park

The shifter linkage may be worn and in need of replacement. Sometimes, it is just a bad bushing, and other times, the mechanism assembly needs to be replaced. The only way to tell is to have a complete inspection of...

Q: Engine light came on saying transmission system malfunction.

Hi there. The code is coming up for the torque converter clutch (TCC) is not working. Check the TCC fuse and see if it has blown. If the fuse is good, then the solenoid on the transmission that controls the...

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 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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...