Skip the auto shop - Our mechanics make house calls

Q: idles rough after heavy acceleration, going up hill, getting off freeway, weak warm start ups

asked by on

My car idles rough after heavy acceleration, going up a hill or getting off the freeway. It runs normal after a few minutes of slow easy driving and accelerating is smooth. Also my warm start ups are weak. When the car starts up cold there is not problem but after the car is warm it hesitates when starting up.

A: The most common cause of this is either a c...

The most common cause of this is either a charging system issue, such as the alternator or battery, or low fuel pressure from a clogged line or failing fuel pump. Either the charging system or the fuel system can have low output once the vehicle warms up and is under heavy demand. They may seem to work under normal condition, but once anything more demanding is required, the faults become visible. To have this checked, a qualified mechanic from YourMechanic will have little trouble diagnosing your acceleration issue and performing any repairs required.

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

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: When you slow down then re-accelerate..sounds like severe downshift.

This is a sudden acceleration that some fly by wire vehicles have been suffering from. Think of the Toyota Prius. Your throttle is electronically controlled and the PCM (Powertrain Control Module) takes a position reading from your foot pedal to...

Q: After 7 miles, car will not shift into 2nd gear

Hello there, thank you for asking about your 1957 Chevrolet Bel Air. There are several potential causes for your concern. The first thing to check is the governor, since it is not internal to the transmission. Governor pressure works against...

Q: Oil leaking from car

Hello, it sounds like you may have a gasket or seal leaking on your car. Smoke in the exhaust could indicate 2 things; you're burning oil or burning coolant. If you're burning oil that usually means your valve seals and...

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...
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...