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When the engine is cold is hesitates like it needs a manual choke. The car is a 1991 and is injected. Started doing this about 2000 miles ago, in the summer months, the weather is cold now and it does the same thing. It has 150000 miles on it. When it fully warms up it runs good. Changed all the sensor with known good one and nothing changed, even changed the mass airflow sensor, any ideas guys?