Hyundai Repair: 1999 hyundai elantra poor acceleration, hyundai elantra, oxygen sensors

Question
99 Hyundia accelation is extemely sluggish. (30,000 miles) Was recently tuned-up and new oxygen sensors. Please help.  

Answer
You could be looking at one of a large variety of problems.  You could have a misfire.  The fuel pressure could be low.  The catalytic converter could be clogged.  

Unfortunately, I don't have a good understanding of what your car is doing other than not accelerating very well.  Without anything else to go on, such as a trouble code, I'm not going to be able to provide a good path for you to follow.

In that case, I'd recommend you take the car to a good driveability shop or the dealer.  An experienced and good driveability mechanic will be able to help limit the possible causes just by feeling the issue you have.