04 aveo no power

[camaro98]

hey guys im new to the aveo world, this is my first one, just picked it up today for pretty much nothing. but its got some issues. the car has 60k miles and is stick. it has a slight misfire in cyl 3 and cyl 4. I scanned it and the misfire counts go up extremely slow, therefore I know its not that bad but its there. plugs and wires are brand new, I even swapped plugs from cyl to cyl to check for a bad plug. its only 3 and 4, im assuming it is either valve seals or head gasket leaking between 3 & 4.
also the car is seriously lacking power, and I get a o2 sensor code for upstream, but I have never seen one take all power away.

any ideas???
also tried the crank sensor re learn, did nothing.

[USAFzac]

Do you have a check engine light on? Check you coolant tank, see if you getting oil in it. Is there oil leaking into the spark plugs? I would do a compression test

[avguy]

Compression or leak down test? Sounds like you definitely have some kind of problem with yours, but just an FYI that lots of folks feel that our Aveos were seriously lacking power on the day they left the factory

[camaro98]

hey guys doing a compression test tomorrow and a fuel pressure test, it feels as though it wont accel over 3500 rpm.. the previous owners ran it to empty on a weekly basis so im assuming the pump may be on its way out. also has a bad hesitation off idle..
no oil in the over flow. the odd thing Is when its w.o.t. it sounds like its trying to accel but it isn't getting either fuel or air.

thanks again