mis fire at 2500 revs Help !

[mike various]

I'm after a few thoughts or idea's about a problem i've got with my car.
Its a 3.9 with hot wire fuel injection system.
The car has an intermittent misfire at approx 2200 / 2500 rpm.
Ive done the following checks:-
It doesn't seem to do it when cold it happens as the car warms up and sometimes it there and sometimes it runs perfect.
Replaced dizzy with known good one no difference,
Replaced coil and put original back on no difference,
changed fuel pressure regulator nothing,
changed dizzy cap / rotor arm no change
changed ecu no difference
new fuel pump, with inline filters no difference

and before zig ask's i've checked the wiring and changed the coolant temperature sensor new one, no difference.
The car supposedly has a mark adams chip in the ecu but it runs very rich you can smell the fuel with it up to temperature.
I didn't check when i had the replacement ecu in the car so i can't comment on the fuel smell.

It's driving me mad and doesn't make the driving experience very nice !!

Any idea's ?

Cheers

MIke

[mike various]

Hi i think it's the hot wire it's definitely not the flapper system.
It's the 14 cux system from memory.
No lambda sensor or air temp unless it's in the air flow meter.

Mike

[mike various]

The ignition amp is on the side of the dizzy and i've swapped that with a known good one still misfires.
Will check the vaccum pipe tomorrow.
It definitely seems temperature related

[mike various]

Thanks for the idea's.

There is a lead on electrical harness that allows it to be plugged into the ecu via a lap top but i have no programme data to link it to.

I'll try the leads off my other car i think they are magnecour or something like that.

The plugs were brand new and have done about 300 miles but i'll get another set. What is the correct grade of plug ?

Thx

Mike