eec fuse on 97 mustang
I recently purchased a 97 mustang convertible w/v6 for my daughter. After having the car 1 week the eec fuse blew (20 amp maxi) and the car died. I had some fuses with me and replaced it only to have it instantly blow again. I had a 50 amp fuse which it also fried immediatly. I towed the car home and tried it one more time with a 20 amp fuse and it worked perfectley - for 3 days. It then did the same thing. I had it towed to a shop and when it got there they replaced the fuse and it worked again???? They tested everything they could think of and let it run for 2 full days but the problem didn't reoccur.
My question is - what could make this fuse blow then fix itself a couple of hours later???????
Any suggestions would be greatly appreciated