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The hard starting problem and the dying problem are probably not related. Some parts stores will check the engine codes for free. The codes will get you going in the right direction. If the code says the Air Bypass valve is indicated realize that the valve recieves a vacuum signal and an electronic signal to make it work, etc. For the dying problem, its probably electronic because the longer you let it cool the longer it will go before the next failure. Sooner or later it will probably die for good, then someone will be able to find the cause. Intermittant problems are hard to find. The codes can help with this, ie. a technician can let it run until it dies then jump on the possible components with a cooling spray. For the hard starting problem a good place to start is to burn a tank full with fuel injector cleaner or gas treatment and see if that helps. The most common problem with rough running is a failed vacuum hose. It gets very hot in the engine compartment and vacuum lines get dry and brittle. Vacuum signals go everywhere. Good luck.
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