Skip the auto shop - Our mechanics make house calls

Q: Barely idles, shakes, shuddering when accelerating

asked by on

I drove my 85 Chevy S10 Blazer from Washington to Montana and since my arrival my car has progressively run worse. It has gotten to the point where I have to floor the gas pedal to get the car to turn over and hold the pedal halfway down to get it to idle at all. When driving the engine seems to shudder when accelerating but smooths out once it shifts and when it's coasting. Air/fuel ratio hasn't been adjusted which needs to be done (4k altitude difference), but I am worried there is more wrong.

My car has 53000 miles.
My car has an automatic transmission.

Hi there. Although the difference in altitude may be an issue, it typically would not create vibration or a rough idle. In most cases, this is due to a restriction in fuel flow, or damaged to a fuel or ignition system related component. It could also be due to a vacuum line that is damaged. It’s a good idea to have a professional mechanic complete an engine inspection to determine what is causing your issues.

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
  1. Home
  2. Questions
  3. Barely idles, shakes, shuddering when accelerating

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: My car is too low for shops. I have about 3 inches of ground clearance. How should I get an alignment done?

Aligning a vehicle yourself is easy especially given the ready availability of tools in the aftermarket which any consumer can purchase. I use Ammco optical toe gauges and a digital caster/camber tool vended by InterComp. You have to use these...

Q: Can a faulty wheel hub cause the rim and rotor to get extremely hot within a few miles..and even smoke if driven for long periods?

You may have a wheel hub bearing that is bad but I think it is your brake caliper that may be causing the rotor and rim to get this hot. I recommend you have the brakes and bearings checked before...

Q: Gauges and check light problem and speakers

Hi there. There appears to be more than one electrical issue with your vehicle.. A common issue for GM vehicles, is IPC (instrument panel cluster) related concerns. Diagnoses needs to be performed to rule out a poor electrical connection at...

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...