I got a chevrolet spark. When cold she runs perfectly, but when warm she jerks the whole time. What could it be? Please help me

I'll need more information to help with this. When EXACTLY does it 'Jerk'? Is it while accelerating gently or accelerating hard? Is it when braking? Is it on the up or down gear change? Does it do it when cornering or driving in a straight line? Does it happen when it is a cold start up or after the engine has warmed up?
All this information will help work out what it could be. Please comment below with this information if you would like more help.

I would say that the choke sensor (or whatever it is called) went bad & isn't telling the computer that it's cold & requires more fuel. Instead of starter fluid, did you try to push the foot feed 1 or 2 times?

It's prob an O2 sensor or another sensor like MAF which is an airflow sensor

I don't understand what you mean by "jerking on start driving". Are you saying that it only jerks when you take off from a start when cold or all the time? How does it run after that? Need more detailed information. My best guess at this point would be to start with a fuel filter. Sounds fuel related to me.

check location on knock sensor, remove first and clean first its full of dirt.

4.3L V6 CPI - center port fuel injection . you need 62 psi .When cold give it a shot of carb.cleaner or starting fluid ! does it start then ?

415-455 kPa (60-66 psi

Revs.
As for the issue of the idle revs, that's perfectly normal. When it's cold outside, every car is supposed to have a higher rev in order to warm up the engine quickly. In more advanced cars, the computer wont even allow the engine to shift into overdrive when it's cold outside in order to avoid extreme engine stress and damage. When it's warm outside, the engine doesn't need to idle high because the engine is already at a good operating temperature. Not much will be needed to get it to the right temperature.
Intermittent Jerking

There is a long list of things that could cause intermittent jerking. I'm going to name all of them for you, but your best best would be to go to a mechanic and have them do an inspection.
Clogged PCV Valve (Possibly if you don't get your oil changes on time, sign of a tune up)
Bad DIstributor Cap (not likely at 140,000 miles)
Clogged fuel filter (Very likely, usually done with tune up)
Bad Fuel Pump (Not so likely)
Defective ECM (also not likely)
Vacuum hoses/leak (not likely but possible)
MAS (Mass Airflow Sensor--not likely but possible)
Fuel INjectors (if so, sign of a needed tune up)
Faulty Spark Plug Wires (not likely if tune up is recent)
Faulty O2 Sensors (possibly)

Clogged Catalytic Converter (Possible)
~Hope this helps

Im having the same issue I believe. I have a 94\' Chevy 1500 and when i accelerate it will jerk like the gas has cut out but it wont stall. It just jerks and slows me down. It only seems to do it when going up a hill. I feel like it could be the fuel pump or possibly some intake gaskets?

fuel air or spark.. dead miss one one or 2wo cylinders indicated ..check plugs /wires / injectors timing and vacuum leaks ...good luck

DOES THE TEMP GAUGE READ HOT OR COLD? SOUND LIKE A COOLANT SENSOR