Hi I’m from New Zealand and have a 1998 Peugeot 306 1.8 XT with an automatic transmission.

My car has developed a Jekyll/Hyde personality over the last few months.

Some days it idles happily around 1000 rpm when started or idling.

Other days it will stall as soon as it is started, only firing when you put your foot on the gas.

On those days it doesn’t correct itself once it’s warmed up. With it struggling to hold 500rpm by itself you have to drive the automatic with both feet so it won’t stall at traffic lights.

What could be causing the car to stall some days but not the other?

What parts/sensors should I be checking and where are they located?

The car was recently serviced but I seriously doubt the quality of the workmanship but what I can confirm is that the battery is strong.

Thanks in advance!