Q: Car runs rough and eventually stalls when idling or at traffic lights

asked by on

When they car is first started, it runs good once they engine has warmed up it starts to sputter and , if they accelerator is not toyched...it will stall, Before it stalls, it acts like it us being choked out, By that I mean then engine sputters, then car rocks, it sounds like it is missing I have done a complete tune up changing the plugs, wires, distributor and the cap; changed the EGR temp sensor and blown out the Mass Flow with MF cleanerand it still runs terrible If I shift into neutral at a stop sign or traffic light, it will not run as bsd..,but still acts like it is not getting air or gas, a I don't know what else to do.

My car has 136000 miles.
My car has an automatic transmission.

Your stalling problem may be due to a vacuum leak in the engine, but one that only when it is warmed up. This would lead me to believe there is a possible problem with the EGR valve and its intake tubes. The EGR may be held open at idle from excessive back pressure from the engine not releasing the feedback valve.

The EGR back pressure transducer may be bad or the engine exhaust catalyst may be partly clogged, but I would say the transducer should be replaced first. Try to check to see if the EGR valve is partly open when this problem is happening. If you need help with this, a certified mechanic, such as one from YourMechanic can come to your location and diagnose your car’s stalling issue for you. From there, they will be able to make any repairs that are appropriate to resolve the problem.

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
  1. Home
  2. Questions
  3. Car runs rough and eventually stalls when idling or at traffic lights

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: Q: Car dies

The most common problems causing the engine to stall are either the crank or cam sensor. The engine will need to checked to see if it has any failure codes and if the codes relate to the crank or cam...

Q: Car sporadically idle high & runs around 1500 RPMS

Hi there. The most common causes of this on your vehicle are either a bad idle control valve, a dirty or failing throttle body, or a vacuum leak. It is very common for the engine to have a vacuum leak...

Q: I think I accidentally put diesel fuel in my 2015 Nissan Altima.

Hi there. Yes, it is possible to put diesel into any vehicle as not all nozzles are differentiated. If this has happened, it's not all bad, but not all good. The bad news is that all the fuel will need...

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 Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...