Skip the auto shop - Our mechanics make house calls

Q: Car idles; must be put in neutral at red lights. 1985 Pontiac Fiero

asked by on

I use my car for general driving, but it is not running very well. The other day I happened to meet a mechanic while I was in town and he, too, has a Fiero. He commented that the really nice thing about them is that they are easy to fix and repair. My car has an idling problem. If I do not put it into neutral at red lights and stop signs, it will die. When I'm driving on the interstate, it is difficult to control my car. It becomes very shaky when I reach 60 mph and then becomes very difficult to steer. The car acts like it has its own mind. It gives that feeling like there are a lot of loose screws that need tightening. In your experience, what is causing these problems?

A: Theses are probably two separate issues. Th...

Theses are probably two separate issues. The poor idle and stalling have numerous potential causes, but the first that come to mind is a vacuum leak. Vacuum leaks allow unmetered air to enter the engine, resulting in rough idle and/or stalling. One of the other things that comes to mind is a faulty idle air control valve (IAC).

As the name implies, the IAC is a stepper motor designed to regulate idle speed. A faulty IAC can result in an erratic idle and/or stalling. The shaking above 60 mph also has many possible causes. It could be something as simple as a bent rim or worn suspension part. The best advice I can give is to have the rough idling issue inspected by a trained technician, like one from YourMechanic.

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: How do I shift out of P?

Before driving, you will need to shift your car out of P. To do so, simply apply the brake pedal, and move the shifter.

Q: tranny shifting irratic

Hello, there can be three types of failures with automatic transmissions, mechanical, electrical and hydraulic. The transmission uses a computer to control shift points and shift feel. First thing, fluid condition, meaning dark in color and if it has a...

Q: Grinding sound when stopping

The grinding noise could be anything as simple as a rock stuck in the backing plate behind the brake rotor to the wheel bearing. The steering wheel shake could be related, but the most common issue is an out of...

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...
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...
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.