Umm! trouble with Idleing

[Davo13]

I have had this problem as well.

This is what I have done and the car is running a lot better, still stalls sometimes but nothing like it was.

Had the fuel mixture reset(it was running 3 times as rich as it should of been)
Replaced spark plugs and leads
Checked all inlet hoses, breather hoses and inlet manifold for leaks.
Cleaned all breather hoses
Cleaned inlet manifold with Forte air intake cleaner.

I am going to change the fuel filter aswell

[Rain]

idle/ignition advance or timing may need a slight adjustment.

[Mk2Kezza]

Right as i've said i've had the rocker cover gasket changed recently and the car has been running badly ever since. I looked at it yesterday and the round flying saucer thing on top of the rocker cover is split where it attaches to the rocker cover.
What is this thing called and is it just a case of getting a new seal or something?
When I press on it the engine seems to idle better.

[rubjonny]

That'll be your problem, 'PCV valve bung' is what it is normally called.  Can get em cheap from ebay/GSF

[speedy gonzales]

Ok...After sloggin away under the bonnet, here is the lastest!

I bought a new temp sender, put it in and ALAS.. ....nothing! the idle problem is still there.  it revs to 2000rpm and then drops to 500rpm (about to stall) before the revs pick up again and ..so the cycle continues.

HOWEVER, if i push in the ISV in all the way I found that the CAR RUNS PERFECTLY (exactly on 1000rpm idle) and when i accelerate the revs come down as they should and not slowly as if i still have my foot on the throttle.

Do you think my ISV is knackerd.  I know some of you guys said that this can be a cause of this problem but what shall i do, shall i order a new one or somehow clean it.

also is is safe for me to drive around with a cable-tier holding the ISV all the way in?  Can this be attributed to a faulty ISV or am i just superficially sorting the problem without actually getting to the main cause of the problem?

Im not to hot about these engine parts so i may sound like a wolly if i have asked ridiculous questions.

faulty ISV or not??

Speedy (not so speedy at the mo!) 

[rubjonny]

Well replace the rubber bung for the PCV first (the flying saucer thing)  The ISV has2 hoses going to it, both should be held on with jubilee clips, if one or both are missing then you wont be getting a good airtight seal, so best you get them replaced ASAP

[Davo13]

That vacuum hose to throttle valve, is that important as I have lost mine?

I had a KN induction kit on for a while, but I decided to take it off and put the original air box back on a couple of weeks ago and the vacuum hose is err missing?

The car wouldn't stall without this on would it?

[rubjonny]

aye it might, thats a hefty air leak!

[Mk2Kezza]

Thnaks RubJonny!!

Changed the PCV bung earlier and she started sweet as a nut!Idling smooth as too! First time in ages, so it appears that the problem is solved. I'll keep you posted as i'm taking her for a spin later. Hopefully no more revving and stalling!

Ta.

[rubjonny]