Boxster Dies on Tickover

[Legba]

I have a 1998 2.5 Boxster 60k miles.

I had a serious misfire last year and after changing plugs and coil packs finally took it to OPC which diagnosed both failed O2 sensors. At that time they disconnected both to make the car run slightly better on my return journey.

I changed the sensors and the car ran perfectly when cold but when the engine reached operating temp it ran rough at tickover and often stalled at junctions. I had a fault code of 'left bank misfire' and random misfire. I swapped the O2 sensors between the banks suspecting one might be faulty but it made no difference.

I then discovered that the MAF had been disconnected, presumably by the IPC, and when I reconnected it the car ran appallingly with heavy misfire in the mid range. I concluded that it was faulty.

I have now replaced the MAF and the car runs brilliantly with the exception of the stalling when I stop at junctions. This only occurs when the engine is hot, not when cold.

Any suggestions?