Quarterback Vinny Testaverde was listed as questionable for the Carolina Panthers' game Sunday against the New Orleans Saints after he showed up for practice Saturday with a stiff back. If Testaverde can't play, David Carr would likely start against New Orleans (4-6) four days after Coach John Fox had said the 44-year-old Testaverde gave Carolina (4-6) a better chance to win. Testaverde had appeared to have recovered from a strained right Achilles' tendon that forced him to miss a game and leave another at halftime. Testaverde had started the previous two games and had practiced all week. A team official said Testaverde was not injured at practice on Friday but awoke Saturday with back pain.