Q: Car is sputtering/misfiring

asked by on March 08, 2017

My 2001 Ford Focus for the past 3 weeks has been intermittently sputtering/misfiring when starting it for the day. It typically will do this while it's warming up in the morning. Sometimes it will sputter once, and sometimes it will continuously do it. When it does I will rev the engine, and when doing so it will then idle rough and high and will kind of shake in the process and act like it's going to stall. If it is still doing it while backing up, it will also sound like it is puttering, and then when going to accelerate, it will hesitate. The car will also sometimes sputter/misfire while driving on the freeway, will let off the gas and press down again and will stop. I have already changed out the spark plugs and wires, the fuel filter, as well as replaced the MAF and the ignition coil. and put some fuel injector cleaner in it. I feel that I may smell something fuel related when putting my nose up to the air vent.

My car has 139000 miles.
My car has an automatic transmission.

Engine is misfiring Inspection $94.99 - $114.99 Get a Quote

Hi there. Sometimes if you can smell fuel vapor under the hood and you’re having random misfiring, the issue is caused by either a small fuel leak from a hose or a vacuum hose that has become disconnected or is broken. It is also possible that an individual fuel injector is not firing as it should or is too clogged with carbon deposits and needs to be professionally cleaned. Typically these issues will be accompanied by a warning light on your dashboard of some sort; so it might be best to have a professional mechanic come to your location and complete an engine is misfiring inspection. This will allow them to pinpoint the source of your problem and ensure the right repairs are made.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

How do I use autoset?
The preset stations on the radio can help you choose your favorite radio stations without having to search for them. There is a feature that will save you the time and trouble of having to manually enter each preset called...
The car won't go into gear while running, makes a grinding sound
The clutch may not be disengaging. This would need to be checked by having the car in gear and clutch in then start the car to see if the car wants to move forward. Do this test when you are...
Squeaking noise coming from under the hood upon cold start.
Hey there, thanks for writing in. The noise can be the serpentine belt tensioner not putting enough tension on the belt. In this case, you would most likely need to replace the tensioner (https://www.yourmechanic.com/services/drive-belt-tensioner-replacement) along with the belt (https://www.yourmechanic.com/services/serpentine-drive-belt-replacement) to...
My car sputters and the Check Engine Light starts flashing after it rains.
When the Check Engine Light flashes, this can mean that the catalytic converter may be flooded with fuel and that a fire hazard exists. Because your car is sputtering, I believe this condition exists for you. When a car sputters...
My car engine is knocking constantly - what does this mean?
Hello. If the engine is running fine but the knock is consistent it may be a few different things. It can be coming from the camshaft actuator or it can be a rod knock starting. I have also had a...
Misfires of several cylinders on highway drive
Hello - this is a known issue, and BMW has a technical service bulletin out to address this (#385317). A software upgrade to the engine management computer is the repair for this. You should check with your BMW dealer's service...
While in park and stepping on the gas at 4000 rpm exactly the vehicles starts shaking.
The engine computer has a built in rev limiter built in to the programming that will not let the engine go above 3800 to 4000 rpms when the transmission is not in gear and driving down the street. This is...
Seeping rear right axle seal
Hello, thank you for writing in. Apologies for the difficulty in obtaining a quote. Smart Cars are a little harder to price out, and our website may not have been automatically able to do so. The average price range for...
Code P0562
Code P0562 relates to low system voltage as you know. This may happen for a number of reasons such as a poor electrical connection, high resistance in the battery cable between the alternator and the battery or in many cases...

Related articles

2012 Ford F-150 vs. 2012 Chevrolet Silverado: Which One Should I Buy?
When you’re ready to really get some work done, there’s nothing like a full size pickup truck. These trucks are ready to haul a big load and really get in there and get busy. SUVs are great for moving people,...
The Best Used Cars to Buy for Towing Light Loads
Towing Towing is tricky business and depending on the weight you’re dealing with, it really determines what vehicle is best for you. If it’s light loads you’re looking at towing, we’ve put together a list of the top five cars...
The Best Used Cars to Buy If You’re an Electrician
As As an electrician, you have to haul around wiring, tools and equipment, and tons of supplies. You can’t get by with a small used car, or even a big one. What you probably need is a good used cargo...