Rough idle, Rough take off and rough stop.

[Niggadore]

Ello.
Lately i've notices a bit of a rough idle.
When the engines cold, it's fine, but after a drive, it gets worse.
Basically what happens is, i'll pull up to traffic lights and just before i stop, i feel a bit of a surge in the engine, i think when it kicks down to 1st is when this happens - not sure.
Then, when i take off, a split second after i put my foot on the gas, it'l surge again, only for a split second and then it's fine.
And also when i put it in drive or reverse.
It started happening about a week after i changed the tranny oil and filter. about 2 months ago i did a full service, oil, spark, filter and general clean up.

I'm stumped as to what it could be, i did a search but no one's symptems are the same as mine.

Cheers, Matt.

[moff_man]

have a look at the throttle bodey, under it there should be a hose sorta on a 90deg bend that goes under the intake manifold runners down the back of the motor. see if the vaccume line had come off, its not uncommon for this line to come out of the 90 deg joiner.

also you should hear louid sucking noise whan running this is not normal. and indicates the line has come off

[alloywelder]

you have a vacum leak at inlet manifold check all vacum hoses if you are sure they are all attached properly by a can of aerostart and spray around inlet manifod where it meets cyl heads if idle smooths out youve found problem also check brake booster vacum line (this is my bet going by info you have supplied) good luck

[Niggadore]

Yep, it was the vac line, must have knocked it out when i took out my amp power cable.

Cheers!

[Freshjivin]

Hmm sounds exactly like mine, did it idle fine when it was in park/neutral etc?
Time to google where the Vac line is and check it i think :P

[Freshjivin]

Wouldn't happen to have a pic of where the VAC line is would ya mate so i can check out mine? can't seem to find any for a VS on google

[moff_man]

directly under the throttle body, it goes under the inlet manifold to a switch block at the rear of the engine