i have nissan maxima 1995 automatic.. i change 2x the ecm its burns again?!

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i check the +postive wire in ckp,maf,injectors,coils, all of them was grounded,(after burn ecm).. if i remove the ecm the no grounded wires,i change the ecm in one turn the car start.. after several minute i put all the accesories, like airfilter and MAF sensor, itry to start to check again ecm burn,