My girlfriend has a 2005 nissan altima with the 2.5 ltr 4cyl and it started having problems when starting after the car has warmed up to normal operating temps. The car had the same problem about a fyear ago and the crankshaft sensor was replaced car worked fine till earlier this week and it started doing it again. Stands to reason it was the same problem cuz it had the same exact symptom so today i changed the sensor out and low and behold the car is doing the same shi@$% anybody on here with an altima or knows someone who had this problem please help me or my precious S2000 is gonna become a glorified taxi cab for the next few days.