my system was ok until i pulled one of my audio leads out that goes from one amp to another, i needed it for my decks (thats were i rob it from in the first place for my car amp) anyway when i put it back in the car im getting engine whineing coming out of my speakers, if i play with lead a bit it goes off but travel down the road a couple of miles and it comes back, i've made sure its not near the power cable, what could it be? and yes i know about supressers but it didn't need one before, it worked fine.