[riber.bentsen]

Hi all

When I rev my engine ('78 4.5 Cis) to almost excactly 2500 rpm, a strong vibration occurs.

2400 is fine, so is 2600. Also there when engine braking. It is most noticeable in 5th gear, since the revs are in the troublesome area for longer, but it's there in all gears including neutral.

Has always been a problem, never goes away, but is lesser when the engine is cold. Put some injection cleaner in the tank and it did help a little.

Shine your wisdom upon my car, ye oracles!