Share 'Nissan (Un-modfd) v-6 problems'

Have a 90 Maxima with v-6 that is pretty much the same engine that they have used up to now. 2.5liter in this case. I have been runnng up to about 50+% E85 until I started to have some engine problems. I replaced sparkplugs, distibutor and wires, coil packs and fuel filter. The car still runs very rough at idle a bit better around 3000 rpm. One mechanic says that the ethanol has ruined somethin...