Hi all,can anyone help? I've got a 94 3.9 disco that runs great on either lpg or petrol,but as it warms up it get a bit reluctant to pick up from tick over,especially on lpg,once the revs get above about 1200 then pulls like a train,as I've already said,not as bad on petrol,tried all obvious...

Hi can anyone help,my disco developed a major misfire and lack of power a few weeks ago after changing plugs leads etc,ran fine to start with then on the way home became lumpy and didn't want to run at low revs,now it starts lovely when cold and after a few mins on tickover will begin to misfire...