td5 defender blue/ grey smoke missfire

hi all was doing a few lanes today td5 04 defender and noticed a fair bit of blue / grey smoke on moderater throttle ussage, it clears if i give it the boot. it alo has a slight miss fire at the lower rev range. there is also a strange note of the exhaust at idle, nearly like a pop . i checked for play in the turdo and all seems grand. there, i pluged in my code reader and crank sensor intermittent, and can traffic interferrance came up. i checked the cylinder imbalance and got
1 +16
2 2
3 -8
4 -2
5 -6
does it look like a faulty injector on no 1 causing my misfire and smoke

thanks in advance gary

Hi, you should check the compression too