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My 82 crossfire runs rough especially when cold but also at idle when hot. After start up while it is warming up it surges from around 800rpm to up to 1800rpm but settles down when up to temperature. Coolant temp sensor seems to be OK, TPS seems to be OK and vacuum seems OK. How do I check if the EGR is functioning properley? Any ideas would be much appreciated here in the UK nobody seems to know much about crossfires.