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

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: When disabling cruise control, SUV kept accelerating to 115 mph

From your description it sounds like the throttle body became stuck. Since this vehicle does not have a throttle cable it is possible that a sensor malfunctioned and caused the throttle to stay on. These vehicles have been known to...

Q: When you did this SRX was it the 4.6L? If so, did you have to pull the front grill, fan, radiator, and condenser?

Hi and thanks for contacting YourMechanic. It seems that the rectifier has failed in the alternator or the diodes are burned in the alternator. This will cause the amperage to spike to the high A/C voltage and try to charge...

Q: Water leaking in mid-section of car

Hi, thanks for writing in. Typically when coolant is leaking in the center of vehicle, it comes from the water pump or the primary coolant line attached from the pump to the block. In order to verify this you can...

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 Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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.