460GLE running problem
I have a K reg 460GLE 2 litre injection, 82000 miles on the clock. It doesnt idle smoothly and also when I accelerate hard it bogs down and lately it has great trouble getting past 4000RPM, it coughs and splutters going through the 4K mark. Fuel consumption is also terrible. I have roughly worked it out and am getting 20 mpg.On a recent MOT it failed due to appalling emmisions.
I have changed all the spark plugs and made sure the HT leads are all ok.
I am at a complete loss to what could be causing this so any help would be greatly appreciated.
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