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[terry paget]

Yes both moving

Both moving, you say. I had a similar problem on a 2.5. I found it hard to check the movement of the plenum dual ram. This one has to be open at idle, then close at low revs to give low rpm torque, and open at high revs to give max power. If it's stuck open it will cause poor torque at low revs. Eventually I found the butterfly was stuck open. I changed it and full performance was restored.
Are you sure the plenum butterfly is closing at low revs?

[Omega russ]

What's the best way to see if the butterfly is opening?
When I deck the throttle from idle the arm on the rear of the inlet goes in.
is that right?

[Doctor Gollum]

Dis pack... is the scuttle foam wet?

[Vega]

Fuel pump?

[Omega russ]

I relocated the dis pack to the front of the engine so it's not that

Is there any way of test the fuel pump or is it just a case of changing it

[Doctor Gollum]

I relocated the dis pack to the front of the engine so it's not that

Is there any way of test the fuel pump or is it just a case of changing it

Have you checked, or are you presuming? All the leads checked/tested? Any water/oil in the plug wells?

When the 3.2 misfired, it would rev well once above 3000rpm, because the engine was spinning fast enough for dropping one cylinder not to matter...

I pretty much guarantee that it isn't fuel related as the engine revs...

[Doctor Gollum]

What's the best way to see if the butterfly is opening?
When I deck the throttle from idle the arm on the rear of the inlet goes in.
is that right?

Terry is refering to the front multiram... pop the two rubber elbows that feed the plenum off and look down if the plate between the two is vertical, then it's closed, if it's horizontal then it's open... valve is the same part as one in the plenum.

[Andy H]

Really stuck with what to try next
Car now has a splutter underload then clears at higher revs

How big are the spark plug gaps?
When my 2.5 did this I fitted new plugs and that cured it.

I didn't take a photo on that occasion, this photo is from when I changed the plugs in my 2.6 to illustrate how much erosion occurs in normal use.

[terry paget]

What's the best way to see if the butterfly is opening?
When I deck the throttle from idle the arm on the rear of the inlet goes in.
is that right?

Terry is refering to the front multiram... pop the two rubber elbows that feed the plenum off and look down if the plate between the two is vertical, then it's closed, if it's horizontal then it's open... valve is the same part as one in the plenum.

I was referring to the plenum multiram. On an earlier V6 car the idle control valve feeds air to the 2-4-6 (left hand) side and can only get to 1-3-5 pots via the open dual ram. Once the throttle is opened dual ram butterfly closes, opening again above 3000rpm.
Having said that, watching plenum ram
 behaviour on my 2.5 I cannot see it move. Perhaps on a cold engine it does not close; must try again when engine is hot.

[Omega russ]

Thanks for the help everyone 
I will have another look over everything weekend and let you know how I get on

[Omega russ]

I've had a look the flap it vertical
It's clean and free moving
I've try another solenoid that I no works and it's still the same

[Omega russ]

I now have a splutter under load all the time
It's fine top end and on idle
Can anybody suggest anything it could be?

[Andy H]

Spark plugs

[Omega russ]

Thanks Andy h will put them on the list of things to check weekend going to take the inlet off an go over everything I can think of checking

[Omega russ]

Quick update the cars been at 2 garages now
Had a smoke test for air leaks found the seals on the breather box leaking sorted them but the car is still spluttering under load intill it's at high revs