In 1991, Becker joined David Lee Roth's solo band to work on his third album "A Little Ain't Enough", replacing Steve Vai, who left the band to record and tour with Whitesnake. While preparing for the album, Becker began to feel what he called a "lazy limp" in his left leg. He was soon diagnosed with amyotrophic lateral sclerosis (ALS; Lou Gehrig's disease) and was given three to five years to live. He finished the recording using lighter (thinner) gauge guitar strings and other techniques, which made it easier for him to play with his weakening hands. Although he managed to finish the album, he did not join the supporting tour due to his inability to perform on stage; former Lizzy Borden guitarist Joe Holmes took Becker's place on tour.