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I have a 03 350z touring. I started having problems a couple months back with a miss, so i did the usual, changed all the spark plugs and coil packs, it ran great for a few days then the car started throwing its self into fail safe mode, engine light came on, slip light and TCS light stayed on. The car started idling real rough and all over the place between 1500rpms-400rpms, i took it to a dealership and they told me to get a new battery and if it didnt work then cam and crank sensors, did both, neither really worked except after all three sensors were changed it stopped going into fail safe mode but still rough idle is occuring, now recently the car idles fine cold but when it gets warm it trys to die so i constantly have to give it a little gas, its now dying and not starting when its hot. It cranks over but doesnt fire up until ive let it set for 20min or so. What is wrong with my car? Lol
 

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It sounds like you've never scanned the car yourself to determine what codes are showing up? Beyond just doing whatever a tech is telling you, have any of the same codes reappeared? Anything else is just a guess.
 

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If it helps, I had a similar sounding issue like 5 years ago. It turned out to be the camshaft sensors (there was one on each side of the engine)
 
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