Skip the auto shop - Our mechanics make house calls

Q: Car running very rough

asked by on

My car is running very rough. I have tried Seafoam in the tank, but it hasn't helped. I might need new spark plugs.

A rough idle can be caused by many things. Injector problems, worn ignition components like spark plugs and wires, or vacuum leaks are all examples of things that can cause symptoms similar to what you are describing. Products like Seafoam are not really meant as a repair, but are more like a maintenance. Here is an example of what I mean: If you have a cavity, brushing your teeth more often wont fix the cavity. It needs to be filled, then you can brush your teeth more often to prevent it from happening again. This is what happens with products such as the one you used. If used as part of a maintenance to prevent they work fine, but they are not meant to correct already occurring conditions. I would suggest getting a mechanic, such as one from YourMechanic, to take a look your vehicle to determine the cause of the rough idle. Running a car with a misfire can damage the catalytic converters making the repair more expensive in the long run.

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

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: Where is the AC dryer on 2004 navigator?

Hi There, The AC dryer is a tall silver colored cylinder shaped component with a couple of hoses coming out of the top of it and is located in a horizontal position near the firewall. If you need further help...

Q: what is the aluminum block with pipes to the brake filler just above the air suspension compressor and do I have to remove it to r

Hello. We will be happy to assist you. It should not be necessary to remove the aluminum canister completely. You may have to move it to the side for clearance purposes but it should be able to stay attached to...

Q: Radiator fan and air conditioning fan not working

Hello. A broken compressor is the most likely cause when the radiator and air conditioning fans don't turn. However, there are other causes for the fans to not turn such as fuses, relay, or wiring to the fans. Also, the...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
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.