poorly disco

[markrhardy]

hi can anyone help,my 3.9 disco lpg is poorly at the moment,recently changed the plugs,leads etc and it ran fine for about 25 miles then developed a serious misfire and loss of power,now it starts fine when cold but after a few mins ticking over starts to misfire when revved,once i get it revving it seems sweet,this happens on either petrol or lpg but worse on lpg,took it for a drive seems to run ok as long as revs kept up,but a bit arkward being an auto,thanks in anticipation,Mark

[Disco Mike]

What brand of spark plugs and wires did you install?
Are you sure you didn't crack a plug or damage a wire when installing them?
Mike

[markrhardy]

Hi thanks for your reply,used bosch super 4 plugs and silicone 8mm leads as sugested by local auto suppliers,thought that may have been problem and have tried new all round but problem the same,someone sugested the ignition amplifier/coil/distributor pick up/head gasket/porous head etcbut would be expensive to keep on changing things,hoping someone had had a similar problem,thanks again,Mark

[singingcamel]

make sure your plug wires are on snug,both on the plugs as well as the coil.check your leads for correct position in the firing order.
i recommend ome cap and rotor..did it run poorly before the tune up?

[Elemental]

Originally Posted by markrhardy

Hi thanks for your reply,used bosch super 4 plugs

I knew it!

Throw that shit away and put in the CORRECT spark plug!

[markrhardy]

HI,thanks again,two things was running ok before tune up,used to pop back now and again when on lpg but as a rule ok,and which plugs do you recommend,cheers,Mark

[Elemental]

Champions... Copper ones, just like what came from the factory.

[markrhardy]

will buy some tomorrow,thanks