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.

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?
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. My truck is running sluggish

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: After replacing the power steering pump there was a low idle, idle screw is all out, running rich, and idle speed doesn't change.

Hi there. The engine has a vacuum leak and is causing the engine to stumble down on the idle. Check all of the vacuum hoses and the brake booster for any leaks. The engine is rich for it's not burning...

Q: Loud grinding noise coming from front of the car.

This could possibly be a wheel bearing failure. Wheel bearings can go dry causing a grinding or growling noise when the wheels are spinning. I would recommend having your suspension system inspected for any play or faulty parts. When wheel...

Q: Car starts, then shakes and idles rough

The fuel injection fuel regulator is leaking fuel into the intake when you are running and causing excessive fuel to get into the engine and this is the reason you smell gas fumes from the tail pipe. The fuel regulator...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...
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...