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What you're explaining now is more indicative of a fuel or control problem. Diagnosis from this distance is difficult, the best I can do without typing out an entire manual is to suggest a few directions. Does the car smoke (white) when first started cold, as maybe an injector is leaking down? Pull off the snorkel tube and inspect the throttle body and plates - if the plates don''t close properly it creates havoc with the controller and idle can be extremely erratic. Try cleaning the throtttle body with a good carb cleaner, and while you're at it do the same with the MAF sensor, if so equipped, just be very gentle with it.
If the problem still occurs check the temp sensor for proper values. I'm thinking that if this continues for very long you may risk your O2 sensor(s) if they're not already damaged.
Let me know what happens.
Beav
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