mine was slow similar to yours...

new lift pump made it better...

also why do ya wanna go above the national speed limit in a disco....

have ya cleaned sedimenter recently?

have ya serviced it, may need new fuel or air filter..
 
I've only had the car for 3 weeks now so it does need a service.
I'm new to disco's so what is the sedimenter and where is it
 
I have worked put what the problem was.
The engine wasn't getting enough air Or was getting too much air at motorway speeds so
I removed part of the snorkel from the air box and now it's working fine. So for now I will only connect the snorkel when I'm off roading. It's only a 2 minute job to do up a jubilee clip.
u sure the air filter aint blocked
 
Don't reckon there's such a thing as too much air. Snorkel shouldn't restrict the flow so thinking you have some sort of blockage somewhere
 
Defo lack of air.what snorkel have you got. If its a diy job and you've used flexy duct,unless its reinforced with wire it will try sucking itself i sideout. Happened to me:)
 

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