2004 Hyundai Sonata Q&A
2004 Hyundai Sonata Question: I loose power when exclerating up a hill or onto a freeway.
Light on? Have a scan test and check cat. converter. Also fuel pressure. - pushrod
Agree with wetry and is it running hot at all? How many miles on engine? - ziptie12
also u could repl fuel filter and see if that helps. - globalhelper
With the work done already, I agree the most likely cause is the catalytic converter needing replacement. Exhaust is not flowing out properly causing the loss of power and the engine to choke itself under higher performance conditions. - csubak30