I loose power when exclerating up a hill or onto a freeway. on 2004 Hyundai Sonata

When I climb a hill, I am huffing and puffing. When I merge onto a freeway, I cannot excler fast enough.

by in Imperial Beach, CA on November 15, 2012
4 answers 1 comment
ANSWER by on November 15, 2012
Light on? Have a scan test and check cat. converter. Also fuel pressure.
ANSWER by on November 15, 2012
Agree with wetry and is it running hot at all? How many miles on engine?
COMMENT by on November 15, 2012
Not running hot. Changed the plugs, wires, fuel injectors and cleaned the sensor.
ANSWER by on November 15, 2012
also u could repl fuel filter and see if that helps.
ANSWER by on November 15, 2012
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.