inner manifold on 1999 Mercury Grand Marquis

what would cause a inner manifold to crack, 85,000,00 miles on the car, bought it brand new. 8cylinder and is this the start of major problems.

intake manifold?? common failure for cracking. about a 500 to 700 job.

1 more answer
Ford has know that these manifolds where bad for years and will only replace the ones for fleet cars,taxis and police.The new ones have a medal front part.Go after your dealer.