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Car starts extremely rough on cold mornings. Takes about 5 minutes to warm up by constantly giving it gas and then runs/starts fine when engine is warm. Getting a code 54 (distributor sync problem). O2 sensor, distance/speed sensor, rotor and hall effect pickup assembly have all been replaced. Any help would be appreciated? Also temp reading swings high and low on constant basis. Any ideas what causes this and how can I fix it?