The generator matrix

 1  0  1  1  1  X  1  1  2  1  1  0  1  1 X+2  1  1 X+2  1  1  2  1  1  X  1  1  2  1  1  0  1  1  X  1  1  0  1  1 X+2  1  1 X+2  1  1  2  1  1  X  X  X  2  0  X  2  X  0  X  1  1  1  1  1  1  1  1  1  1  1  1  1  1  X  0  X  2  X  2  X  0  1  1  1  1  1  1  1
 0  1  1  2 X+1  1  X  3  1  0  1  1 X+2 X+3  1 X+2 X+3  1  2 X+1  1  X  3  1  2 X+3  1  0 X+1  1 X+2  3  1  2 X+3  1  X  1  1  X  1  1  0 X+1  1 X+2  3  1  2  X  X  0  2  0 X+2  X  0  0  X X+2  2 X+2 X+2 X+1  3 X+1  3 X+3  1 X+3  1  0  2  X  X  0  2 X+2  X  0  X  2  X X+1  3  2
 0  0  X X+2  2 X+2  X  0  X  2 X+2  2  0  X  0  2 X+2  2  X  0 X+2 X+2  2  X  2  2  2 X+2 X+2  X X+2 X+2  0  0  0 X+2  2  2 X+2  0  0  X  X  X  0  X  X  2  X  X  X  X X+2  X X+2  X  2  0 X+2  X  2  0  2  0  0  2  2  2  2  0  0 X+2  X X+2 X+2  X  X  X X+2  2  2  0  0  0  0  X

generates a code of length 86 over Z4[X]/(X^2+2,2X) who´s minimum homogenous weight is 84.

Homogenous weight enumerator: w(x)=1x^0+29x^84+44x^85+94x^86+72x^87+12x^89+1x^96+2x^106+1x^116

The gray image is a code over GF(2) with n=344, k=8 and d=168.
This code was found by Heurico 1.16 in 0.34 seconds.