mk3 colour concept shuddering!!!

[muzo26]

   I have managed to get my colour concept running again after being sold a dodgey set of leads but now its shuddering but not all the time just occasionally, i have put on a new dizzy,plugs,leads and no.30 relay.
   It feels like it is not getting enough fuel when i put my foot down there is nothing just starts shaking and shuddering but it's not all the time just occasionally. Any advice please?

[rubjonny]

what make of bits are you fitting? still sounds like its missfiring, so if be looking at plugs, cap, leads and arm. if 1 set was dodgy out of the box id be wary of the new set, unless they're all known good quality make bits. i only use bosch/beru for ignition parts, or ngk

[javalin]

GSF sells a decent set - for about £32 + vat a set. I think its part “92631F” desc “IGNITION LEAD SET-BQ G3 1.6/1.8/2.0 GTI 8V”

James

[muzo26]

 The leads plugs etc are bosch £70 +vat the car seems to be getting worse and i can't even take over now on the motorway. Replaced relay no.30 because it seems like it is being starved of petrol. There is plenty of petrol coming through as i took the pipe off and it did,nt seem like it was being resticted in any way, it went everywhere.
  Any ideas please?

[muzo26]

   Problem solved unplugged the maf and hey presto!!!!