Skip the auto shop - Our mechanics make house calls

Q: What causes the engine to run rough and the engine to die when the accelerator is pressed?

asked by on

Okay I have a 1999 Chevrolet Silverado it's a LS Edition with a 5.3 leader V8 and when I start the engine it runs extremely in a low idle and it wants to die and when I hit the accelerator it does not do anything but hesitate I just wanted to know if you could help me out on diagnosing this further down to where I need to be I replace the crank position sensor and I replace the throttle position sensor the mass airflow sensor the fuel pressure regulator cleaned the injectors replaced the fuel filter and fuel pump and I still can't get it running can you please help me thank you

My car has 183430 miles.
My car has an automatic transmission.

A: Hello. You have covered most of the common ...

Hello. You have covered most of the common parts that fail with the exception of the idle air control valve/module. This is a unit that works similarly to the mass air flow sensor as it regulates the air intake into the throttle body at idle or low speeds as it is mixed with fuel prior to being injected into the motor. When this is not working properly, this can cause the motor to starve or be flooded with too much fuel depending on its condition. I would recommend having an expert from YourMechanic come to your home to diagnose the rough idle and replace the idle control valve if necessary.

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: Engine light is on and car shakes

This may be related to a faulty throttle position sensor or potentially a dirty or failing mass air flow sensor. The mass air flow sensor is a unit in the intake system that monitors air intake as it is mixed...

Q: My car hesitates and I have to press on gas hard for it to kind of smooth on out.

Typically, what you are describing is due to an engine management fault(s) and such faults occur in ignition system components, the fuel system, and/or the air induction system. A possible first approach is to just simply make sure that the...

Q: There's an oil leak coming from my valve gasket or VVTI seal oil area

sent to CS.

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...