Islamic foreign ministers agreed today to take up Iran's complaint of foreign pressure on Moslem nations -- a thinly vieled reference to the possiblilty of U.S. economic sanctions over the hostage issue -- during their emergency meeting here on the Soviet military intervention in Afghanistan.

The Iranian issue was one of two added to the agenda of the foreign ministers' meeting, which starts Sunday.

The usually well informed Pakistani newspaper, The Muslim, reported today that Iran was demanding that the Islamic foreign ministers call for the extradition of the shah to face charges in Iran.

Informed sources, however, said that demand was softened during preliminary meetings today to a vaguely worded declaration opposing "foreign pressures on certain Moslem countries."

According to sources here, this was a reference to U.S. attempts to free the 50 American hostages being held in the U.S. Embassy in Tehran by imposing economic sanctions on Iran.

The United States has postponed pressing these sanctions until after the Islamic foreign ministers' meeting to avoid embarrassing those Moslem nations supporting its stand against the Soviet military takeover in Afghanistan.

The foreign ministers also agreed to take up the question of Arab-Israeli relations, specifically the return of Moslem holy places in Jerusalem to Arab rule and the setting up of a Palestinian state.

Although these items were not on the original agenda, they were expected to be included as a matter of course.

As a result of Friday's decision to postpone the start of the meeting by a day, at least one of the "steadfast states" -- Libya -- has now agreed to attend.

Libya, Syria and the Palestine Liberation Organization originally had refused to attend the conference since it was starting on the same day as Israel and Egypt normalized relations.