Q: Car is idling rough - 1983 Jeep CJ7

asked by on

When I start the car and drive, it runs fine while I'm accelerating. At the moment when I apply the clutch and the brakes, it sounds as if it would stall. During idling, it doesn't stall out, but it's very rough. The issue is even worse If I brake hard. I went to the mechanic and he had the fuel pump and carburetor replaced with new parts and repaired the valves. The problem is still there, but the performance has been slightly improved. What else can I do to fix this?

Hello. This behavior sounds like the power brake booster has a leak or rupture, which acts like an air leak to the engine. Since the brake booster vacuum is generated by the engine’s air intake, their functions and potential problems are interconnected. This could be causing the "near stall when braking" as you describe. I recommend having a professional mechanic, like one from YourMechanic, diagnose the rough idling issue and replace the brake booster if necessary.

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

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!
  1. Home
  2. Questions
  3. Car is idling rough - 1983 Jeep CJ7

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: Found misfire on all cylinders by code reader. I checked vacuum and it was low at 14 hg. I checked compression 160 to 180 except no. 3 cylinder 180 to 270.

Hi and thanks for contacting Your Mechanic. When it comes to a misfire, first check for spark and make sure that the spark plugs are functioning correctly. Then check the fuel injectors and make sure that they are not plugged...

Q: Ford Taurus

I am not sure what the question is here. If you have a question about your vehicle, please visit Yourmechanic.com and click on the ask a mechanic link to ask your question.

Q: starting problem, like weak battery..

Hi there. It sounds like a battery concern. Have the battery tested with a digital battery tester that provides current voltage, cold cranking amps, and state of health. If it has a low state of health or a bad cell,...

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 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.
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.