For a 1999 Mercury Grand Marquis with a 4.6L overhead cam V8, the intake manifold bolts should be tightened to a torque specification of 11-15 ft-lbs (15-20 Nm). The tightening sequence typically follows a crisscross pattern to ensure even pressure distribution. It's important to first hand-tighten the bolts before applying the torque to ensure proper sealing. Always refer to a repair manual for the most accurate and detailed specifications.
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