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I can see how this would become annoying quickly! Have you any dash lights coming on and what are they. Have you OBD 2 scanner and have you run a test for codes on the vehicle. This can point you in the correct direction to start with.There are multiple reasons for your particular issues. 1. possible crankshaft positioning sensor may have short out. 2.Fuel pump may cause vehicle to stall duet to inadequate pressure while engine is running.3. If the main system relay or ignition switch fails the engine will stall intermittently, once the electrical connections cool down the system will operate again until heated. The computer system uses a steady supply of voltage to operate. You can test the main relay. Once the relay has been identified, gently grasp or touch the relay in question, have a helper turn the ignition key to the on position, then crank the engine over, the relay should click in one of the ignition switch positions. If so the trigger circuit of the relay electrical system is working. If not pull the relay and inspect it and the location it plugs into for any signs of burning or melting. You might try the wiggle test with it running to see if it shorts out. These relays when aged tend to break down from age and the heat and can become damaged inside easily causing intermittent problems just like your having.4. The obvious stuff to check are the battery, its cables and gound points just as a precaution and check that the battery is fully charged.5. The oxygen sensor may also be a issue. When a feedback sensor short circuits it can cause the computer to shut down, sensors most prone to failure deal with extreme heat like an oxygen or coolant sensor.This is where a obd2 scanner pays for itself (autel al519 or better autel al619) as the dealer will charge 75.00 to 125.00 just for pulling the codes which takes all of 4 minutes. (SO pay up now and get one it can save the DIY thousands of $)
Additionally a shorted sensor doesn't always set a check engine light or MIL (malfunction indicator light). The computer is programmed to trigger a "service engine soon light" when the sensor has failed for a predetermined amount of time, say one minute, it only takes an intermittent shorting sensor one second to stop the computer system (stall engine). To troubleshoot this problem, temporally disconnect major sensors one at a time and retest ie: oxygen, coolant and MAF. (This will cause a service engine soon light, codes will need to be cleared after testing). When troubleshooting a stalling problem additional codes maybe present such as an EVAP code which should be ignored until the more major problems are repaired.
 
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