Econoline E350 1 Ton V8-5.4L CNG VIN M (1999)
26. Remove the nine bolts.
27. Remove the upper intake manifold.
1
Lift the intake manifold.
2
On 4.6L and 5.4L NGV, disconnect the Intake Manifold Tuning Valve (IMTV) connector.
3
Remove and discard the upper Intake Manifold gaskets.