help my s13 is not healthy

[Smokntire513]

My car just started giving me problems... my check engine light is on and i took it in a couple days ago to get the codes pulled n i got a misfire on cylinder 3 and a code for egr valve and tps. i was pretty sure the injector on cylinder 3 was bad or clogged so i removed it and attempted to clean it and since i connected everything back up my car now feels like it is running on just 2 cylinders. i took it out for a quick drive and if wont accelerate any faster than 30-40 mph with the pedal to the metal. i just replaced spark plugs, wires , fuel filter. can anyone help me figure out what is wrong here. i have a single cam ka n was thinking maybe bad head gasket but i just did a compression test and numbers are decent. also i see a little oil coming out of the header what can be the cause of that??

[DiamxndCrew]

You have an EGR code don't ignore that one because exhaust flow back into the intake can cause a density misfire. My 2cents

[Smokntire513]

The previous owner put a screw in the hose going from the top of egr to intake should I just plug it back in or can that cause problems. Or should I replace both valves if necessary just to b safe.

[DiamxndCrew]

If you can test the tps aswell that can cause problems too. Do you have a dmm? Or know somebody with a known good tps? False readings can give pcm false data to use. But oil on the headers seems abnormal you should consider a shop if you keep having trouble.