vbland

so i have a 1999 5.7 k1500 4x4, i have a new EGR and TPS. however i am getting a code for both of those which are brand new, it is intermittent. i havent seen them in awhile and then the other day it was raining out and they kicked back on, i cleared the codes to see if it was just a fluke, they came back on a few hours later. then when i stared my truck this morning it was gone, no light, however when i came back to my truck a few hours later they were back... if anyone has any idea or advice it would be much appreciated.