Car not starting or turning over indicates towards multiple possibilities. It can be issue with battery or weak battery. But if battery checks out ok, then it can be starter issue or faulty alternator or problem with low fuel pressure or no spark at spark plugs due to dirty spark plugs or faulty ignition coil or injectors getting cracked or dirty and needs to be cleaned.
To confirm the problem, the basic troubleshooting is required.
Click this link below and follow the troubleshooting:------
http://technoanswers.blogspot.in/2012/02/car-starting-issues.html
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Also its advisable to go through this additional help links:----
Loss of acceleration? http://technoanswers.blogspot.in/2012/02/loss-of-acceleration.html
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How exactly the Vehicles Accelerator Cable works?
http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-cable.html
How exactly Vehicles Accelerator Pump Diaphragm Works? http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-pump.html
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stalls and bucks on Acceleration? http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html
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Acceleration lag problem? http://repairhelpcenter.blogspot.com/2012/01/acceleration-lag-problem.html
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Car loses power while acceleration? http://schematicsdiagram.blogspot.com/2011/12/car-loses-power-while-acceleration.html
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This will help.
Thanks.
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