Golf GTI cuts out at traffic lights ,roundabouts etc

I would suspect the ignition system has a faulty part like a ICM or distributor pickup coil.

I'm sorry but I believe you have this posted in the wrong product category. Please re-post the question in the proper category This is the car and truck problem category

sounds like a loose connection somewhere start by checking the earth connections to gearbox and engine.hope this helps

try the mass air sensor.......

try removing battery and cleaning all the ground under the battery tray and check main ground wire from battery to engine

my first solution would be to check all the timing is set up properly and you will probably find that the distributor is not timed up right

could be the oil breather thats clogged up with oil or it could be the maf, try and see if that helps

Check out the rubber/metal flange that joins the carburettor to its manifold. Wait while the engine is cold. Then check if the carburettor moves . Do this by taking hold of the carburettor and moving it a little side to side. The rubber mounts are known to perish after a time and this can cause air to be sucked in through the cracked flange rubber and in turn causing the engine to drop revs. The flanges are a replacement part and not too expensive so its a relativley easy fix if this is the problem.
GOOD LUCK

ive bought a cat back scorpion exhaust for my mk4 2.0 golf gti the problem is its banging off the bottom off the car witch is doing my nut in i bought a 4motion rear valance for the cut out for the tail pipe witch was a waist of time as the exhaust is no where near the cut out as it will not go any higher because its already hitting the body does any one else have this problem your advice on this would be helpfull thanks

It may be the fuel filter try having it replaced