You’re not accidentally hitting the cruise control by any chance?
If not then definitely get the car checked over by a professional mechanic ASAP
There can be a variety of causes from driver error to electrical or mechanical problems.
The throttle plate might be sticking and not returning to its correct position. Sometimes it simply that the floor mats are interfering with the petal. Or, A vacuum leak, sensor that has failed, or an EGR system malfunction could potentially be the cause. Or, it could be a software problem in the car.
Your best chance of finding out if this is a problem common to your model of car is add that model to a google search of your question. At the end of the day, you are going to have to eliminate several potential causes and most of that sort of elimination requires tests by a mechanic.
ENGINE HESITATES WHILE ACCELERATION
LOSS OF ACCELERATION
It
can be fuel pressure issue or it's the problem with accelerator pedal or its
clogged filters causing there.
There
are many other possibilities. I suggest you to go through the list of help
links mentioned below, these will help you to confirm where the actual fault
lies: -------
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http://technoanswers.blogspot.in/2012/02/loss-of-acceleration.html
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http://howtobyme.blogspot.in/2012/02/headlights-flickering-and-car-hesitates.html
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http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-cable.html
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http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-pump.html
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http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-engine-lean-codes.html
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http://whatisbyme.blogspot.in/2012/05/2004-toyota-avensis-acceleration-and.html
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http://technoanswers.blogspot.in/2012/04/wheel-hop-under-hard-acceleration.html
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http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html
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http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html
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http://repairhelpcenter.blogspot.com/2012/01/acceleration-lag-problem.html
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These details will help.
Thanks.
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