NFL: KANSAS CITY (1-2) at SAN DIEGO (1-2) <h3>Chargers host Chiefs in battle of struggling running backs</h3> Kansas City (1-2) at San Diego (1-2) 4:15 pm EDT SAN DIEGO (Ticker) -- Through three games, running backsLaDainian Tomlinson and Larry Johnson have not come close todisplaying last season's form. They will try to get untracked on Sunday when the San DiegoChargers host the Kansas City Chiefs in a battle of strugglingAFC West teams. Tomlinson was coming off a banner year for the Chargers in whichhe rushed for a league-high 1,815 yards and set an NFLsingle-season record with 31 touchdowns. But he has yet to find a groove under new coach Norv Turner,rushing for only 130 yards on 57 carries. In last week's 31-24loss at Green Bay, Tomlinson was held to 62 yards on 22 carries. The Chargers dropped their second straight game and, at 1-2,already have matched their loss total from last season, whenthey finished an NFL-best 14-2. "I don't know if there is a problem yet," Tomlinson said. "Ican't put my finger on one particular thing, but obviously thereare some things going on. It just isn't happening right now." Tomlinson enjoyed his best game last season at home againstKansas City, rushing for 199 yards in a 20-9 victory on December17. Johnson, who finished just behind Tomlinson in rushing lastseason with 1,789 yards, also has been held in check, runningfor just 140 yards on 40 carries. He managed a meager 42 yardson 24 carries in last week's 13-10 win over the MinnesotaVikings. Sunday's game matches two of the league's most disappointingoffenses - the Chargers rank 27th and the Chiefs 29th. Kansas City recorded its first win of the season last week butcontinued to have problems moving the ball, managing just 56total yards and four first downs in the first half. Damon Huard came alive somewhat in the second half and finished20-of-29 passes for 206 yards and a touchdown. The Chiefs handed the Chargers one of their two losses lastseason with a 30-27 victory in Kansas City, but they havedropped three straight in the series in San Diego.