misfire when in traffic

[gteyes]

Hi guys,

Over the last week or so my 1990 8v gti Pb digifant has started to misfire and sometimes cut out when sitting in traffic. Car drives 100% on motorways no missing no lack of power only when I come into traffic and sitting at idle for a while engine starts to develop a misfire and cuts out restarts straight away give it a bit of acceleration and it splutters and then clears itself of the misfire,  happens only when engine is warm.
The only thing I have noticed when it starts to misfire if I pull the bonnet and leave it up it won’t happen but it I leave it closed it will start to misfire from this I would think its heat related thinking it could be possibly the coil heating up

Was just wondering if anyone has came across this before

Dave

[mattkh]

Hi
I think its because you put your hand to the boot lever area.
Make sure all the relays, especially the fuel pump relay, are seated tightly.

[gteyes]

have checked fuel system even done fuel pressure test all with in spec have also crosed over relay and driven stilll same fault happens

what i mean about bonnet open is if i pull in to the side open bonnet in the air, after about 2 mins car will run fine again only when i close it again with out moving misfire happens hagain with in five minutes

[golfmk4owner]

Thats really odd mate. I wish i could give you advice but i only have sympathy on this one 
I can only really relate misfires to ignition (sparks, coil, leads) and fuel (filter, injectors, pump).
But then you knew that already im sure!