Recently changed battery, spark plugs and there is lag

If the spark plug fires at the wrong time, this could lead to constant rattling, pinging or knocking sounds. Hard vehicle start. If your car is having trouble starting or just feels disjointed and jerky, your spark plugs may not be working right, and this can lead to misfires and erratic performance.

4 Signs You Need to Replace Your Spark Plugs

· Rough Idling. If you notice that your engine seems excessively loud while you are sitting at a stoplight or stop sign, your spark plugs may be to blame.
· Engine Misfires.
· Surging and Lagging.
· Reduced Fuel Efficiency.

Read more about How Often to Change Spark Plugs here.

check the plugs again and see if they are oily again, if they are NOT oily check the ignition coil if it is giving current to all four plugs, if not ,change it.it might be shorting out when it is hot.........If the plugs are oily again, and assuming the valve cover has been changed,sorry to say you have an internal eng.piston ring problem. more tests must be done to pin point the problem.

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.

Sounds like the catalitic converter/s are clogged up. This would cause low air flow and low compression. I've seen them so bad that they dropped the compression down to 60 lbs.

Clean any carbon from the throttle body bore and plate. Make sure your spark plugs are good .

I had a serious lag issue with Genius Easypen F610E. You draw a square but the signal is laggy and it is unable to draw it properly. Leaves even a trace behind (see pic below with black squares). Searched the internet for solutions, it seems some others have the same issue.
Changing battery didnt help. Changing computer and OS didnt help. But its an issue of electrostatics (pen, tablet, your body) as I noticed. I needed to wrap a foil around the pen's upper part, and connect it to battery's minus terminal. That fixed the lag problem. Its not pretty, but it works.(see green squares in the picture).
It's seems to be a design flaw.

dunno if it'll fix it- but check your pcv valve - 5$ for a new one - also check your egr valve- should be able to move depress it with your finger- if not, carb cleaner is safe to use to clean it up- remove it and clean it. this should help the idle

change your spark plugs and make sure battery is fully charged got to build compression back up

no its not normal for it to hesitate try a good full tune up(spark plugs, plug wires, air filter, fuel filter, oil change, ect.) that most of the time fix any lag you might have