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When you say it "jerks," this description could fit several actual symptoms. If by "jerks" you mean the engine misfires, it could be caused by the need for a major tune-up (including plug wires and distributor cap), or it could be a problem with fuel delivery, contaminated fuel, or defective components in the fuel system.
I assume the CHECK ENGINE light is on (and has probably been illuminated for some time now). Begin by doing a readout of the stored codes, and use the results to begin your diagnosis.
If by "jerks" you mean the transmission is slipping (engine revs but car slows down or doesn't accelerate), you have a transmission issue. If the transmission fluid and strainer/filter have not been replaced within the past 5 years or 50,000 miles, have a complete transmission service performed.
If by "jerks" you mean that the steering wheel wobbles or pulls, you have a problem with the front suspension.
If by "jerks" you mean that the car shudders or pulls when you apply the brakes, you need brake work.
I think I covered all of the "jerks." ;)
Could be a restricted exhaust, possibly the catalytic converter. Easiest way to test is to drop the "Y" pipe and see if performance is restored. Obviously it will be very noisy when testing.
I have worked a similar situation before, the white smoke that you see more than likely mean that you have a blown head gasket. That's antifreeze that blowing out the tail pipe, with a blow gasket it can cause the vehicle to **** and have poor acceleration. The suddenjerking motion can trigger the TCS- traction control system. Its almost like the vehicle is slipping when it **** like that, So I do believe that you need to replace the head gasket, and not a complete overhaul. Good Luck
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