Check if the idle is rough and if rpm dips then dies. You may just need to have the intake cleaned (tuner cleaner) out or check vacuum hoses for loose or leaking ones check also for leaks in the intake after the air filter. Check if all cylinders has spark. Check also if the fuel filter is clogged. If the car just dies without warning you may have to check additional items, the distributor may be going bad, the fuel pump relay or the fuel pump itself. It would be best to have a scanner used to see if you can retrieve errors to accurately identify the issues.
To correct this problem get a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, spray it into the air intake of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speeds problems you may need to seek the help of a professional.
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