No. 16 Michigan (4-1, 2-1 Big Ten) at Illinois (2-3, 0-2), Saturday at 12 p.m. EDT (ABC). Line: Michigan by 22 1/2. Series record: Michigan leads 70-23-2. WHAT’S AT STAKE? The Wolverines need to get and stay in a rhythm offensively to prepare for tougher tests coming up at No. 10 Penn State and against