2.8 help please?

[mrprecovery]

hi i have a 2.8 auto dorchester(granada)

 

it has a pierburg carb.

 

just recently it has been running really bad.

seems to be missing a little. on tick over it hunts really bad.

rev counter nearly hits 0 then shoots up to 1500

and does this constantly.

 

thing is when you open it up it really flys and runs fine. the minute you go to stop problems start. also runs sh*t up to 3000 ie if you drive normal.

 

any help is as alway grately apreciated?

[Col-ashtonmobile]

they suffer badly from vacuum hose air leaks , remove the air cleaner assembly and check all the hoses especially the ends