Skip the auto shop - Our mechanics make house calls

Q: Truck will act like it is not getting enough fuel when cruisng. RPMs drop then comes back up or under load

asked by on

idles great, mash down accelerator runs fine put a load on it stumbles acts like it out of gas

My car has 230000 miles.
My car has an automatic transmission.

A: Hello. I think you have called it, this is ...

Hello. I think you have called it, this is almost certainly a fuel supply issue. Installing a fuel pump pressure gauge which can be observed while driving will confirm this. Sources could include a worn out fuel pump, a fuel pump relay with burned contacts, a clogged fuel filter, clogged fuel injectors, or a failing fuel pressure regulator. I would recommend having a loss of power inspection completed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and estimate for repairs.

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・Save up to 30%

Get a quote

What others are asking

Q: Creaking sound at the rear end, at lower speeds

From what you've described it sounds like a problem with your suspension, there is a couple of things you will need to inspect. Check and lube any of the rubber sway bar and control arm bushings. Inspect the springs that...

Q: is it common for the timing chain to go out on this model truck?

This is not likely related to the timing chain as the truck would not fire at all if the timing chain were out. If the truck does fire occasionally, this suggests you have spark and fuel which is good. This...

Q: crank shaft sensor issue

Hello. This can be caused by a number of different things. I usually start by scanning the computer for codes. This would give me a good idea of what is going on.If there are not any codes then I check...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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.