I have an exhuast leak in the front not sure if it is from the cat or the exhuast itself...

I checked the codes it gave me the following codes :

0210

I right away changed my left bank Oxygen sensor the code came back on and this time

1003 fuel pump module I belive??

came on aswell..

I need some help not sure what is wrong with my car..

My rpms go up and down all the time When I come to a stop the it stays at 1k then drops in a few seconds anyone know where to start to fix all of these issues let me know.

Could the exhuast leak be causing all these issues? and the engine to run lean? or is it something bigger?

I did not have these problems till I cleaned my TB and changed my Head gasket could I have caused these problems? Car runs ok but with the CEL..

 

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