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I think you have an engine speed sensor fault. its not reading the engine speed or the motion speed. needs these two to change speed and ( gear). one is connected to the abs unit and the other is on the engine. usually if they both go its down to the gear box ecu. you can check if you have it on a ecu reader. will have fault codes or not be read at all.
Your car should not turn off while driving, After your revived car has been running a few minutes, turn off the engine and see if it will restart on its own, no cables attached. If it starts, you should be okay.------------------------------------------------------------------------------- KWP2000 Plus ECU REMAP Flasher Tunning
If your main ecu is bad, it will cause a delay in power reaching the fuel pump relay, causing a delayed start condition. The check engine light has to come on, in the dash, for the fuel pump relay to get power.
Hi im thinking there is a fuel pressure problem, this could be the regulator of the injection line. this is supposed to keep pressure in the fuel system by closing when the engine is turned off. in there line as well is a sensor for the ecu, this tells the ecu the fuel pressure so it can start or open more for more fuel into the system i think one or both of these has failed, if it fails the fuel by gravity will go back to the tank.
Disconnect alternator wiring; disconnect battery for a minute; reconnect battery & see if it starts & runs. If it works, replace alternator. If no difference, could be ECU error caused by alternator fault or carelessness with wiring when installing (spark to ECU perhaps). Check ECU codes (short the two-pin blue socket sitting loose on the transmission tunnel below the dash, switch ignition on and count any flashes of the check engine light (MIL))
this could be one of a number of problems, the check engine light can mean anything from a faulty sensor to much bigger things, i would suggest you take it to a autoshop and ask them to retrieve the ecu codes for you these will tell you what is wrong