ej20g engine help

[mn4a15]

my engines doesn't have any power i took off the manifold to paint it and now the car runs weird? when i first cracked it up it didnt. so i switched the fuel injector lines fired right up. but the idle is still very erratic? i checked the vacum lines and fuel lines grounds cooling lines and connections all good but it does the same? i test drove it and when i floored it when no where? could it be that one if the pistons isn't firing? thanks guys?

[XanRules]

uh, put the injectors back how they were and check your plugs.

[Batlground]

There is a possibility that 2 are right and 2 are wrong. What else did you disconnect?

[mn4a15]

There is a possibility that 2 are right and 2 are wrong. What else did you disconnect?

i think thats the problem. i think i switched up the injectors plugs. everyone is saying that its a vacuum/boost leak. so imma change vacuum hoses.gaskets,and new cooling lines. check spark plugs?

[Batlground]

Doesn't hurt to check those too.

[XanRules]

shoot me a PM and I can come help someday.