F 250 2WD Pickup V8-5.4L CNG VIN M (1999)
4. Install the three-way catalytic converter to exhaust manifold nuts.
5. Connect the EGR valve to exhaust manifold tube upper fitting.
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On 4.6L engines, tighten both fittings starting at the top in two stages.
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Stage 1: Hand1 tighten.