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Hello Phil.

This is going to sound a little peculiar.

The resetting the ECU is a good idea but the reason your engine is hunting through the rev range at idle, usually between 400-1200rpm is because of.......

dirty battery terminals and connectors! Weird, huh?!

Get the car to operating temperature and switch off.

Disconnect the battery terminals, clean them thoroughly. Clean the cable ends as well.

Reconnect everything. Unplug the ecu fuse (passenger side under bonnet next to strut tower) and plug it back in after a couple of minutes.

Should fix the problem.

Cheers,

Andrew
 
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