My 2001 hyundai elantra (automatic) loss power while driving

2001 Hyundai Elantra

I hope your problem will be solved :))

check for vacuum leaks in the small rubber hoses.

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:

http://en.allexperts.com/q/Hyundai-Repair-815/2004-Elantra-GT-transmission.htm

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

the sensor is on top of the passenger side drive shaft in the diff housing

you may have broken motor mounts

at the exhaust manifold there is a flex joint in the exhaust pipe
what you describe indicates that that flex section has failed and need replacing
There is no transmission problem

i think ur tranny started sliping then after reving it high, u must have over heated the motor causing it to puke out some coolant.

I just had this problem on a 2001 elantra. I took it in for repair: the MAP (Manifold Absolute Pressure/ intake air temp) sensor was shot. $150 later it works just fine.

NEED check engine light code. just shooting in the dark, but it could be your throttle position sensor or the gear indicator (some times called neutral safety switch). to try and reset it (works on some models) when its doing this (giving you grief). pull over to the side of the road when safe and shut off the car (put in park) then press the accelerator all the way to the floor for 30 seconds. then start the car (take foot off of accelerator first) might cure the problem. engine error code would be most helpfull

I had an Issue like that on my 2001 Hynudai Elantra GLS and it ended up needing to have the Ignition coil replaced.