I have changed a few cylinder heads under warranty for this type of problem. The exhaust valve guides wear, this causes the exhaust valve to seat badly, giving low compression. if one cylinder compresion reading is more than about 50 psi below the others, then this warrants head removal. It is quite a job, due to the fact that the camshft id chain driven. If you are up for it then once the head is removed, poor liquid into the exhaust ports and see if it leaks out through any of the exhaust valves.
2002 seat leon 1.4 Uneven tickover plus minus 500. stalling sometimes. airflow sensor/ coolant...
(More)
2002 seat leon 1.4 Uneven tickover plus minus 500. stalling sometimes. airflow sensor/ coolant sensor?