1998 GMC Safari "z24 p0113" Questions

...Z24 2.4L and when i step on the gas it makes a pop pop pop sound like its miss fireing so i took it to the auto store and code P0113 IAT Sensor well i havnt had one in over 6 months it has been ...

...z24 cavalier reading error codes po340 and po113,,,what do i need to do? also lights trac off and check engine came on and car shifted hard putting into drive. thank you! :) P0113 P0340 Camshaft ...