Channel 13 has decided not to pre-empt the first half-hour of the U.S.-Romania World Cup telecast tomorrow, WJZ programming director Michael Easterling said yesterday.

Originally, Channel 13 was going to show a 30-minute infomercial at 4 p.m., when ABC's coverage of the 4:05 game begins. Now, WJZ will pick up the telecast at 4.

Easterling said the switch was in response to calls to the station about the delay, reported yesterday in The Sun, and to the strong ratings performance for the American team's opener last Saturday.