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

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: p0171, back fires at idle, lack of power and red hot catalytic conterter?

The P0171 trouble code relates to a "lean condition" and applies generally to many makes and models of cars. This simply means the air/fuel mixture is lean meaning that there is too much oxygen present in relation to the amount...

Q: Should a warped cylinder be caught in a diagnostic inspection?

Hey there. It sounds like you had an alternator problem and it was replaced. Then the water pump went out and you overheated the engine. When you blew the water pump, the mechanic could not check to see if the...

Q: Cooling fan faulty

Hi! The fans on earlier Acura's usually develop these issues. The issue is usually caused by a faulty fan control switch. But may also be caused by a faulty fan, a faulty relay, or faulty fan wiring. I strongly suggest...

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 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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.