94pathfinderrr

okay so i'm currently limited to tools at my disposal. but i changed my oil, added some fuel injector cleaner and topped my tank off with premium gas and reset the ECU. the error codes are gone, but now the check engine light blinks whenever i press the gas peddle. So i'm thinking i either have a fuel injector stuck open (exhaust is blueish and i'm burning thru alot of gas) or my TPS sensor is fskced up but i when i go into diagnostic mode now i cant retrieve any codes, it only comes on when i press the gas. and ideas?

So I found this forum when looking up how to manually check my check engine light, thanks guys But now I found it's throwing codes 51 and 34. Knock sensor and Injector circuit. Where do i go from here? The car runs rough when the light comes on, but fine otherwise. I have rebuilt fuel injectors, like 6 months old. Is the knock sensor going off because of an injector problem? Or is the knock sensor broken and need to be replaced? Please i could really use some advice, this is my only car and i'm lost without it