Q: Engine pulls/bucks at highway speeds

asked by on

Last week my car started pulling on the highway around 60mph 2500ish rpms. I thought it was the vaccum advance and swapped it out. It was leaking so I thought the issue was found and solved but now it does the exact same thing around 50mph 2000ish rpm. I have better vaccum pressure now but i don't know what it could be.

My car has 56000 miles.
My car has an automatic transmission.

It sounds like you have a lean misfire or an ignition misfire. I would start by checking to see if the coil is putting out a large hot spark. Then replace the points and condenser as necessary. If the problem is still happening once these are done, lightly spray the ignition wires with water at night to see if the wires are arching. Replace cap, rotor, and wires if they are, along with a new spark plug set. Check to make sure carburetor is clean and tuned.

I’d suggest you get the vehicle looked at by a qualified technician who can diagnose your harsh driving symptoms firsthand. They will be able to perform the checks that I’ve mentioned and make any repairs that are necessary to get your car running normally again.

Was this answer helpful?
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. Engine pulls/bucks at highway speeds

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: Removing brake light bulb

Hello. The brake light bulb for your vehicle uses a twist lock type base. To remove the bulbs, gently push down to unlock them from the base, and then rotate them counterclockwise and out. If the bulb is stuck, gently...

Q: Changing brake pads

Changing brake pads "alone" is really not a task that exists. If a vehicle needs new brake pads, or brake shoes in the case of drum brakes, that means that the rotors (and/or drums) have to either be turned, replaced,...

Q: My 2008 Mercury Mountaineer seems to be burning coolant. Temperature gauge reads normal but after driving several miles I swear I

Hi there. It's possible that you're not using the correct coolant or the right ratio of coolant to distilled water. Unless the coolant bottle says "pre-mixed", it's likely that you're adding straight coolant instead of a 50/50 ratio of coolant...

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 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...
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...