My speaker wires go into an actual harness which is a screw type reciever on the body panel then the door has the attaching piece. So I stayed with the factory wire's they were not giving me the problem. The L/F speaker on mine was an intermittent thing also sometimes it would work others not. I think it is a speaker from on your car TourDeForce. The door panels come off pretty easily so I would swap a speaker and see if you get the same problem. If it is only one speaker doing it and not all 4 trouble shoot that speaker with another one.
Now my question for Gliderjoe or anyone is how many watts/rms does the stock amp put out? Since I am still using the factory HU.