deltadog74

hi i know this isn't a racing question but maybe somebody can help. i have a 99 2dr 4x4 tahoe and have 3 codes coming up. it was reading just 2 and i must have fixed 1? the codes are po138,140,and 340. the one i fixed was po102. i replaced the camshaft sensor but still getting the misfire occasionally along with the same code. is the 340 code causing the o2 sensor to read something wrong? i replaced a cam sensor in my 02 s10 and had the same miss, then changed the dist. and that fixed it. do i need to change the one in my tahoe as well, or just remove it and put it back in?

also my fuel gage stays on full but it flutters the whole time. is this a sign of needing to change the sending unit or is there an easy fix i dont no about. anybody no how to help me? or should i just wait for obama to buy me a new 09 tahoe and just say hell with 99(lol)