Skip the auto shop - Our mechanics make house calls

Q: Rough idle when in drive..but idle is fine when in nuetral or park

asked by on

Truck idle is rough when in drive with no acceleration (stop signs, red lights, traffic) but idle is fine when in park or nuetral. . Check engine light just started flashing recently

Hi there. Check for vacuum leaks on the engine. A small leak will cause the engine to stumble when the rpm’s are low, like in gear on automatic transmissions. Look around the intake manifold for the gaskets being broken. Check all of the vacuum lines for any signs of leakage with loose ends or cracks in the tubing. If you need further assistance with your engine running rough only at a stopped position with the transmission in drive, then seek out a professional, such as one from Your Mechanic, to help you.

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: Frozen ac pump

If the a/c compressor pulley does not turn and is seized you will need to see if the inside compressor clutch shaft is seized or the compressor pulley bearing is seized. Sometimes the pulley bearing seizes and ruins the front...

Q: 1994 Chevy C1500 won't start even when jumped

Either your battery is discharged to the point it won't take a jump or your battery cables are loose/damaged/corroded. If the vehicle has no lights whatsoever and it won't crank, the problem definitely has to do with the battery. A...

Q: EGR valve stuck closed in 1988 F-150

Although it says the EGR valve is stuck closed, that's not going to make the car stall. You would get more nitrous oxides in the catalytic converter fluid. So, it doesn't affect that. The EGR valve problem is not the...

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...
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...
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...