running rough please help

[redgolf]

hi guys i just drove my new mk2 home its a 1.8 8v 4+e
and its seems to run like a pig
It kinda stutters and doesnt idle very well changing from 1,000 to 2,000 revs at random times
but when i put my foot down it seems to sort itself out
also there is a pipe coming from the airbox thats not attached to anything should this have a filter or something on the end

ill put some photos up when i get to work tomorrow 

[lemski]

If the airbox is on top of thew carb then the pipe with nothing on the end use to have a cold air feed into the wing. Doesn't matter if there int a cold air feed.

[redgolf]

cool well thats one thing sorted,
any idea about the poor running

[lemski]

Well my 1.6 driver had a webber carb and when that wasn't set up right on the h2o in ran sh!t. Plus is it timed correctly? Hasn't had owt done to it modification wise is there?

[redgolf]

no its a completey standard motor except a radio lol also i noticed on the engine on top of the clutch cover bit there is a plastic bung with a hole in the middle
what is it and is it important ?

[lemski]

That's to time it up with the fly wheel mate it has a hex screwed in the gear box then a bung. Its for timing the engine. With it running rough have you made sure the coil is all tight and where the wires go. It just occured to me my gti went loose on low tention side I think. But we cleaned it all up and it was better. Hope this helps bud
Liam

[redgolf]

nice one good call with the coil ill check in the morning before i set off for work also im not very good with mechanics is it easy to check/fix
cheers fella

[lemski]

Take the spade connextions off the coil see if its clean if not clean it and one connects to the roccker just clean that up. Am just going from what av done. And maybe my mechanics qualifications. But am not 100% sure. Haha

[jezza16v]

Try pressing down on the carb when its idling, if it idles better then its probably the rubber gasket between the carb and the inlet manifold thats split letting in unmetered air. see if it wobbles, its a common failure. When you put your foot down the vacuum sucks the carb down tight and it runs ok. could also be a vac leak into the manifold from one of the many pipes. Pics would be helpful. The loose pipe could be a breather, if so it should be connected somewhere.

[lemski]

You'll also hear a hissing noice with vac pipes. And my engine was out by the time the carb rubber gasket went but there only bout 15 gbps