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Sounds not good. Question how long was car driven before it overheated. Next thing check your oil if there is a white milky kind of sludge in oil then you may blowen a headgaskit if thats the case you may need a new engine.
Your transmission fluid is dangerously low (tranny is dry). The pops & jerks are the transmission internal components trying not to seize onto each other due to lack of lubrication and/or overheating. Low transmission fluid leads not only to loss of lubrication but lots of overheating (of the tranny). The loss of Elantra performance (speed tops out at 55), is caused by power loss due to friction inside the transmission. All your power is lost overheating the transmission (toward destruction), instead of being transmitted through the transmission to the wheels.
The 2004 Elantra takes Hyundai SP-III Automatic Transmission Fluid, with 8.4 quarts used in a total refill - but just 5 quarts at a fluid change. For How-to transmission fluid change instructions:
www.autozone.com claims that 2004 Hyundai Elantra can take these non-Hyundai ATF's: Lucas Semi-Synthetic Multivehicle ATF Pennzoil Muilt Vehicle ATF Valvoline Maxlife Dex/Merc ATF Castrol High Mileage ATF