my 87 GTI with the S3 engine & Motronic transplant has been running for 1500 kms, starts easily and idles smoothly, it has some serious sputtering at low revs under load and will sometimes will cut out but restart easily.
Today a big power loss in low revs and no restarting for about 30 minutes, did this 3 times and I walked home 3kms, went back later started up, died after 2kms, started again and limped home slowly.
1 hour later it has spark and fuel to rail. I should have checked this when the engine died.
It has a full tank of petrol, Any ideas would be appreciated.