Skip the auto shop - Our mechanics make house calls

Q: Rough idle, seems to misfire but never dies and no Check Engine Light.

asked by on

When stopped at a light or idling, it seems like the engine wants to quit or it seems to hesitate. It feels like it is misfiring but it is random, not rhythmic. Sometimes, it won't happen at all even when I listen for it but the next time I am stopped at a light, it will happen. Sometimes it is more severe than others, even making one think the engine will die but it never does. There never has been a check engine light and I don't think the mileage is worse than before although I haven't checked it. It started happening after I tried to repair the AC/heater blower motor switch because it wasn't working in all four speeds. It ended up with only the two fastest speeds but then we noticed this hesitating or maybe misfiring. In fact, it wasn't happening when the fan was off. But then it started happening all the time, fan on or off. I replaced the blower switch with a new one but it did not completely get rid of the hesitating. It seems to have reduced it, I think.

My car has 220000 miles.
My car has an automatic transmission.

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: Have to accelerate slowly or dies

Hey there. This problem of stalls on acceleration is most likely caused by the carburetor accelerator pump is not pumping fuel into the engine when the throttle is pressed. This explains the vehicle running great at steady speeds and idles...

Q: How do you change the language on the rear view monitoring system?

In addition to providing you with a live video feed of the area directly behind your car to assist with backing out of parking spots and other situations where you need to use reverse, the rear view monitoring system also...

Q: I have a broken spark plug in the head cylinder in my bmw. Do you repair these kind of technical issues

Sent to CS. Not sure if it was sent yesterday or not - disregard if it was.

Related articles

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...
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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...