A/C = ECM troubles?

So I just got hold of a 94 LeSabre Limited with just over 50k orig. miles. The ecm was replaced at 46,777 miles(before I got it). A week ago I replaced the ecm @ 53K. Now the fuel gauge is starting to be wierd again along with a radio that changes stations but doesnt regester such changes on the display.I fear that soon the new ecm will be fryed. I read in another thread some where that the A/C blower could be the cause.
Any help on this problem would be awsomely apprieciated.
THX:banghead: