Jerking and losing power

may be you should make a diagnostic and you can do it in a garage or you can do it by yourself if you want to do it by yourself you need some tools and you can find some good ones here: xcardiag.com

My car loses power while driving & also jerks in first, second, third gear. 1993 Saturn SL1, five speed

For car running hot and overheating issues, I suggest to you go through this help links. Click this link below and go through the troubleshooting procedure to take care of the problems: ----Car runs hot? http://howtobyme.blogspot.com/2011/11/car-runs-hot-in-traffic.html
-----------All types of car overheating problems and troubleshooting?

http://technoanswers.blogspot.com/2011/11/all-types-of-car-overheating-problems.html
Car freeze overnight and started overheating while driving?http://technoanswers.blogspot.com/2012/01/car-freeze-overnight-and-started.html-----------Engine Overheats and heater blowing cold?

http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

---------------------------
Car overheats and Air blows hot at idle?
http://howtobyme.blogspot.com/2011/11/car-overheats-and-air-blows-hot-at-idle.html
--------overheating? http://schematicsdiagram.blogspot.com/2011/12/buick-century-overheating.html
----------Car engine Overheats and transmission starts slipping?http://schematicsdiagram.blogspot.com/2011/12/car-engine-overheats-and-transmission.html
----------This details will help.Thanks.

Need more information, like, is it losing water along with any other issue you can describe.

Assuming your vehicle is equipped with an Automatic Transmission, it will have a model MP6 or MP7 Transmission both of which have dipstick tubes. Fluid is checked when the following conditions have been met:
1. Engine is warmed up after having been run 15 minutes.
2. While engine is running, Fear Selector has been moved through all ranges and lastly into park.
3. KOER, remove trans dipstick, wipe clean and fully reinsert.
4. Remove dipstick again, and inspect fluid level on stick. It should be between the FULL HOT Mark and the ADD 1 PT or .5L Marks.
5. If needed, use only Dextron-III Automatic Transmission Fluid (ATF)

Its time for an full ignition tune up and paying close attention to ignition cables and crusty connections at the coil towers where the wires connect.

Your MAF sensor is dirty. It's in the intake and can be cleaned. Use CRCelectronis spray cleaner. do not touch ,rub, or brush delicat and very expensive. do not use compressed air, It will dry on its own. Location, in the air intake ducting in a metal dectio, Wires should give it away. Good luck and make sure your air filter is kept clean and leak free. Ned_

yes, run scanner for trouble codes

If the temp gauge is reading normal, the lights are flashing, and the coolant level is full, the level sensor in the coolant bottle is the problem. I'm a service consultant for a Saturn dealer and I've run across this many times.

check ur charging system(batt and alt)