Skip the auto shop - Our mechanics make house calls

Q: When driving at a steady rpm or passing speed, my truck hiccups really bad. I replaced the valve cover gaskets&harnesses already.

asked by on

When driving at a steady rpm or passing speed, my truck hiccups really bad. I replaced the valve cover gaskets&harnesses already. Id like to get this issue fixed so I can drive without the constant bother of it shaking. Thank you.

My car has 118000 miles.
My car has an automatic transmission.

Hello.

From what you described, it appears that your vehicle may be experiencing some sort of misfires. This can be caused by a few things. However, if the valve cover and harness have been replaced then they are likely not the cause of your symptoms. Issues with the turbo, fuel system, or engine management system can all cause a vehicle to experience misfires. As the possibilities could be many and possibly difficult to diagnose, I would recommend having a professional technician look at the misfiring issue.

Regards,

Eduardo YourMechanic

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!
  • Home
  • Questions
  • When driving at a steady rpm or passing speed, my truck hiccups really bad. I replaced the valve cover gaskets&harnesses already.

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: Transfer case show 4x4 high when put into 4x4 low

Make sure that the truck is in park or neutral when shifting to 4x4 low. If it is, and you're still getting this problem, you can try driving forward a bit to see if it engages in low gear. But...

Q: My car overheats so much that I can't drive it.

If there is trapped air within the cooling system, it will overheat quickly as they have described. The first thing to determine is if air is trapped and, if so, get that resolved. There is always a possibility of an...

Q: Won't engage gears 1994 Ford F250 4WD

Hi - for your "no movement problem" I would first check fuses for the transmission and 4WD controller. Then check the electrical wiring connections both to the transmission and to the 4WD controller. Perhaps the vibration of the railroad crossing...

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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...