It sounds like you're experiencing the same problems as ConnContour:
http://www.contour.org/cgi-ubb/ultimatebb.cgi?ubb=get_topic&f=3&t=004389

You two may want to exchange notes.

Also investigate if what you have is a failure in the TRS:
http://www.contour.org/cgi-ubb/ultimatebb.cgi?ubb=get_topic&f=3&t=003417


Black '98.0 GL V6/MTX, tints, SVT airbox (sans fender boot), stock muffler replaced with spiral racing muffler, A6 side markers, Cougar 16" polished wheels w/ bald 205/50/16 Yoko A520's, Mobil 1 5W30, Castrol SATF/Ford FM tranny cocktail, 9005 high-beam bulbs all around, re-aimed stock foglights