SEATTLE, DEC. 2 -- Norm Johnson's 42-yard field goal 4:25 into overtime today gave the Seattle Seahawks a 13-10 victory over the Houston Oilers.

It was their fourth straight last-play decision. They've won three of them, including a 13-10 victory in San Diego last Sunday night on Johnson's 40-yard field goal in overtime.

They stopped the Oilers' run-and-shoot offense when Bernard Ford fumbled at the Houston 27 as Tony Woods tackled him. Dave Wyman recovered, John L. Williams ran twice and Johnson connected.

Warren Moon, who had passed for 300 yards in each of his previous four games, threw for 232 today. He ran out of time in the fourth period at the Seattle 25 after passing eight yards to Ford on a play that cost the Oilers 13 seconds.

The Oilers (6-6) also seemed about to win earlier in the fourth quarter. But Moon's pass hit Allen Pinkett's hands and then his shoulder at the Seattle 6. James Jefferson intercepted to stop a 55-yard drive that began with 8:47 to go.

Houston tied the score at 10 early in the fourth quarter on Moon's two-yard pass to Ernest Givins.

The Seahawks had taken a 10-3 lead with 1:37 left in the third quarter on Johnson's 39-yard field goal after rookie defensive tackle Cortez Kennedy caused and recovered Moon's fumble at the Houston 19.

Seattle led at halftime, 7-3, after going 79 yards for a touchdown on Chris Warren's one-yard run 24 seconds before halftime. Warren, filling in for Derrick Fenner after Fenner hurt his hip on the second play of the drive, ran into the end zone on a sweep around left end.