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.

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 1,000 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. What causes the engine to run rough and the engine to die when the accelerator is pressed?

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: My car shuts off when driving?

Hi there. If you already replaced the camshaft position sensor and the engine light comes on with the codes for the same issue, then the Mass Air Flow sensor (MAF) could be defective or dirty. Remove the MAF and clean...

Q: Why The lighting volt its on after 45 minutes ?

Hello. Most of the time this is caused by a bad battery. This is a very common issue that will occur if there is a battery or alternator failure. I usually load test both the battery and the alternator to...

Q: I have a 2004 Hyundai Santa Fe with bent valves on both heads. I'm wondering if this is worth fixing?

Hello, thanks for writing in. I will try to help you with this. If the car has no other significant repair needs (i.e., costs), the calculation is fairly straightforward. If other repairs are required it is much more complicated. So,...

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...
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 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...