Q: Rough idling, hard shifting and shuddering at the highway

asked by on

I bought a previously owned car, which has some issues both while idling and driving. When the vehicle is not moving, like at the traffic light, it idles very roughly. Also, it is very hard to shift gears while I'm driving on the highway. The hard shifting is accompanied with shuddering and chirping sounds. What should I do?

Thanks for writing in about your 2002 Isuzu Trooper. The rough idle may be due to the fuel injection system being dirty or having an engine vacuum leak causing a lean condition. The hard shifting and shuttering with the chirping sounds like you have an automatic transmission lock up converter problem and should have the transmission checked. I recommend having a transmission expert inspect your rough idling and hard shifting issue in order to make the correct repairs for this scenario.

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. Rough idling, hard shifting and shuddering at the highway

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: Steering wheel squeaks in reverse and when turning

Since the noise appears to occur while turning, I would have your mechanic check for a loose or failing accessory drive belt (often called a 'serpentine" belt). Turning puts more load on this belt, and it may be slipping. A...

Q: Knocking in engine

Hi. I will assume the car has a manual transmission in which case, there is a bolt underneath the shifter that helps the gear linkage pivot. Over time, this bolt can become loose which will create the extra play in...

Q: Can't shift out of Park

Hello. In this case, there can be many possible culprits, ranging from a failed brake light switch to a broken shifter mechanism. Since you noted that you have a faulty column shift handle, it would most likely be best to...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.