Skip the auto shop - Our mechanics make house calls

Q: My truck is running sluggish

asked by on

I changed my spark plugs and wires, some of the plugs had non foulers on them. I first left some of the non foulers out, because some of them did not have any oil on them. When I started my truck up it wasn't really missing or anything. But when I go down the road, it runs kinda sluggish so I put non foulers back in, and it still runs sluggish. Any suggestions? Thank you.

My car has 165000 miles.
My car has a manual transmission.

A: Hi there, thanks for writing in. If the eng...

Hi there, thanks for writing in. If the engine had non-fouler plugs in it then you need to do a compression test. If the engine is worn then it will need these plugs and may not be able to produce good power. Most of the time though if there is no oil on the plugs and if the compression is fine then this may be a sensor or fuel system issue. I usually check the fuel pressure first to make sure that the fuel pump is fine. I also change the fuel filter if that has not been done recently. If the fuel system is fine then I test the MAP sensor as this is a common failure and will cause a low power issue. If you want to have this low power issue taken care of, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose and repair this.

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: My 1989 crown victoria loses the power assist after its been driven for a while and warmed up and only when you are trying to park

The main cause of low power steering assist at lower rpms are caused by not enough pressure produced by the power steering pump. You can have the pressures tested to see if the pump is putting out enough pressure at...

Q: Good

Hi there. In order to keep your Jeep Grand Cherokee running great, you might find our maintenance schedulevery handy. This will let you know when routine service and maintenance is due.

Q: Weird squeaking noise

Hi there. The washing the truck was the clue that leads me to believe that your squeaking noise is caused by excessive brake dust clogged between the brake rotor and pads on your GMC K1500. As brakes heat up, dust...

Related articles

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...
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...
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.