Last night, i installed a second amp to power my 4 speakers. After installation, everything is working fine, then all of a sudden the music begins to get really distorted, and will sometimes just stop and sound like normal, or i will have to turn off the head unit and turn it back on. Is this due to a possible wire is cut and touching some metal?

And also in the installation, my Sunfire gauge cluster stopped working. Any ideas?
Lucas