S2 Gags when cold, rough when hot ?

[SIMON67]

Any help gratefully welcomed -

Starts fine & idles fine but blip the throttle & revs die then pick up again. this makes cold running very frustrating.

When hot is much better - the big flat spot goes away
Pulls well & goes like the clappers BUT feels like it is on 5 1/2 cylinders. Something is not right.

Gunsons fault finder says all is Ok. Checked valve clearances, plugs, dizzy & leads look newish (8mm silicone). Don't know what to try next.

I am booked on the rolling road at Progress Engineering on Monday but this is a bit of a stab in the dark as they specialise in the Rover lump.

Cheers

[Heath]

Is the throttle valve sticking? This would make your revs drop then increase quickly before settling. You would also experience a loss in power.

If it's okay at idle, I can't think of anything else.

[SIMON67]

This could indeed be the problem & I will have a look when it stops raining. Could this be caused by the bucket loads of crud being sucked through the air flow meters as the air filter disintegrates ?

I discovered this by chance yesterday - it was falling to bits as I touched it !

Cheers