Idle problems 90Q (NG engine)

[Kent McLean]

Eyvind Spangen wrote:
> I'm having serious idle trouble with my 90Q with NG engine.
> 
> Main problem: It will either idle high, hunting up and down 
> between 1000 and 1500 rpm, or it will idle so low that it 
> almost stalls sometimes it does stall.

Does the NG have an oxygen sensor?  This sounds like a classic 
failing O2 Sensor.  It gives bad readings, which cause the ECU 
to send more/less fuel, causing the hunting at idle.

Can you pull the diagnostic codes? 

-- 
Kent McLean
'94 100 S Avant, "Moody"
'89 200 TQ, "Bad Puppy" up in smoke