rough/stumble running

[steviejasp]

Hello chaps.
Can any one suggest an answer to a slight niggle ive acquired over the last couple of trips.
I had the big 12k service about 300 miles ago but this has developed in the last 50.
It seems to have lost the smoothness around 20 -30 mph. Stumbles a bit and a bit jerky.
It also hesitates/stumbles for a fraction of a second when you floor it in 2nd and 3rd at lowish speeds. It still revs cleanly after the initial stumble though.
Any ideas? Worth changing anything? or can somebody local stick it on the laptop for a few beer tokens?
Many thanks
Steve

[pmessling]

did they change the plugs on the service? or anything related to the coils, plugs leads.

I had simular when i brought my cerb, i replaced the coils, leads and plugs and solved it, although which one it was i'm not sure, the plugs seemed good condition, and the leads where oem, so i would guess the coil.

[steviejasp]

I would imagine the plugs would have been changed as serviceable items but i dont think leads and coils would have been.
I might get some as a matter of course

[brakedust]

Maybe worth checking that the Batt terminals are down tight, they may have disconnected them and not tightened it up properly.
Failing that, as suggested have a look at ignition system, and the big fuse as this can give sporadic tickover.
I have a dedicated Laptop and cables etc, if you can get to Odiham you can borrow them for a while (6 weeks to be precise as im away on work!)

[FUBAR]

My money is on coil packs. Have had them go a couple of times with similar hesitation under gentle acceleration. Clears as you put your foot down?

[steviejasp]

Thanks lads.
Yes, it does clear after the initial stumble.
Reckon i'll get a couple of coil packs then and see what happens.
Are there any recommendations on make/supplier?