engine noise driving me nuts

Where is it grounded? Also it could be bad equiptment. Check to see if you have a buddy that can loan you an amp for a couple of minutes. Swith it out and see what you have. It could also be your battery.

the ground for the amp is on the back left shock.Just cut ur frame and drag the thing!

First, create your own ground on a sturdy piece of frame metal, sanded to bare metal, and use a star washer. Factory bolts are the worst way to go. Then screw a piece of 3/4" MDF to the back of your seat, then screw the amp to that. It sounds like you have an awful ground loop, and your isolator is just a band aid, so get rid of it. Second, eliminate the possibility of the noise coming through the RCAs. Try an audio signal from an outside source - an IPod or personal CD player will do. Run an RCA from your outside source with everything else the same. If the noise is not present, your RCAs are picking up interference. If I'm not mistaken, your battery is on the passenger side, but most of your factory power is run down the drivers side. Your best bet for the signal is down the center. Finally, I also recommend upgrading the big 3. See the sticky on the car audio forums main page. If you do all of these, and you still have a noise problem, have your equipment bench tested at a shop, or substitute parts one at a time until you find the problem. You don't have to buy new equipment to substitute if you have a friend who will let you borrow theirs for a few minutes.

    Have we tried turning the gains down?

I have all the gains down on the amp. but i am going ahead and try what austincustoms said and give you guys the results when i have time. thanks alot to anybody that have tried to help on this. but im goin on ahead and ordering a new amp because alot of people told me that this amp i have is a piece of garbage anyways. Just cut ur frame and drag the thing!