my 98 disco does a sort of twitching as Im driving along the highway and when I step on the gas. Its like it is miss firing or something. I can still drive it long and short distances, but you can definatley feel the twitching on the highway. All the plug wires seem fine.

I was wondering what would be causing this. Could it be a bad catalytic converter? I think I recall the cat causing this on a previous vehicle.

any thoughts?

Thanks

 

When was the last time new plugs and wires were installed?
That is the first place to start.

 

I will replace them and report back

 

Also replace the fuel filter. What octane gas are you burning, when did you last run a good additive, lie BG 44K thru the tank and an induction cleaning?

 

im burning 92 now. this disco is new to me, so I have not added any additives yet. seafoam?

 

put in new plugs, the previous ones were black. It no longer hesitates or twitches. I have new wires to put in when the engine cools, but I definatley notice a 70 less twitching. by the way, on my 98 disco at 127000 miles the plug wires say "lucus" or what ever, and I am guessing they are original. replacing them should allow me to move on to the next issue.

 

I have one extra plug wire and both ends of it are the same..does anybody know where this one goes? all other 8 are attached and the hesitation and twitching is gone/!

 

maybe the pack you bought came with a coil-distributor wire you didnt need?...

 

i dont think so. its a 98 disco 4.0 do i need it?

 

You bought plug wires for the wrong engine.
No big deal, that extra wire is for the coil to the distributor.
What plug wires did you buy?