OTTAWA, Dec 1 (Reuters) - Canada's opposition parties promised on Monday that their proposed coalition government will move quickly to stimulate the economy, but they were unable to estimate the cost of their plans.

The opposition parties -- the Liberals, New Democrats and Bloc Quebecois -- which have accused to the Conservative government of not doing enough to help the economy, said they will direct aid to the automobile and forest industries.

The parties said they cannot give a date for introduction of a stimulus package because they do not know yet when Governor General Michaelle Jean will allow the new coalition government to replace Prime Minister Stephen Harper's Conservative government.

"What I want you to know is that we will act much more promptly than Mr. Harper, and in a much more efficient manner for workers and their families," Liberal leader Stephane Dion told a news conference in Ottawa.

The proposed government will be led initially by Dion, but will not push for the carbon tax that he championed during the campaign for the Oct. 14 election, a policy that was attacked by both the Conservatives and the New Democrats. (Reporting by Randall Palmer, David Ljunggren. Writing by Allan Dowd, editing by Peter Galloway)

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