Skip the auto shop - Our mechanics make house calls

Q: My 92 F150 cannot get up to speed

asked by on

My 92 F150 4x4 5.0 V8 will have a high idle until i shift it into gear, then at the top end of each gear it will just roar and sputter slowing down the vehicle before shifting and accelerate again. When i floor it it just roars and sputters, replaced the fuel filter, the relays for the fuel pump, replaced the distributor, and replaced the spark plugs. Tranny fluid is full and clean, oil is full and clean. Check engine light is not on.

My car has 170000 miles.
My car has an automatic transmission.

A: Hi there. From the description you have pro...

Hi there. From the description you have provided, leads me to believe the IAC (idle air control) valve is sticking causing the high idle. The roar and sputters upon acceleration could be a fuel starvation issue caused by, a faulty fuel pressure regulator and/or a faulty fuel pump. A fuel pressure test would confirm this possibility. Another possibility could be, the exhaust system is restricted, ie; a restricted or plugged catalytic converter. I recommend having your vehicle’s cannot get up to speed accelerating be diagnosed and repaired by a certified technician, such as one from 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!

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: Truck idling high

Hi there. You may need to have the carburetor adjusted or you have a binding throttle high idle choke linkage. A major vacuum leak can be something that can lead to having a high idling vehicle. A primary cause for...

Q: How do I use Trip A/B mode on the Uplevel Message Center?

In the helpful Uplevel Message Center, there is a Trip A/B mode. This mode allows you to track the time, distance, average MPG, amount of fuel used, and odometer of a particular trip. To use the Trip A/B mode. ...

Q: Rough Idle After Engine has Heated up.

Hi there. Check the engine oil pressure. When the oil is cold, it is thick and when its warm its thinned out. If the oil pressure drops lower than 25 psi, then the variable valve timing solenoids will not work....

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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.