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erratic startup 93 940 900 1993

1993 940 SE auto. Help! got a recurring problem which only happens in UK summer. Now the weather's got a little warmer when I startup the engine seems to hunt up and down for 15-20 seconds@ between 200-800 rpm before suddenly finding its feet and coming up to a steady tickover @ about 900 rpm. Any attempt to move straight off while its doing this and the engine will cut for sure the first time you back the throttle off. I hardly have this problem at all in winter but when the air temp outside is @ 15 deg C or over it seems to happen often.
Any suggestions? I've some mechanical experience but i'm no expert.






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