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.

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
  1. Home
  2. Questions
  3. My 92 F150 cannot get up to speed

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: Car spits an sputters like it's misfiring if I accelerate too fast. But does fine any other time

Hey there. The first thing I would check would be the fuel pressure. But there are several possible causes for this condition. There could be a vacuum leak, the engine may need a tune up, or any number of other...

Q: Replaced alternator

Hello, and thank you for writing in. With the new alternator installed, make sure the installation is holding. Double check all of the electrical connections are clean, dry, and tight. Make sure the battery is working and is capable of...

Q: There is something amiss with the performance of my car, but no warnings saying what.

The coolant always being brown indicates either very extensive corrosion in the cooling system, or possibly a head gasket issue. If the condition of the oil seems good (not milky or creamy), then it may just be extensive cooling system...

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 Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...