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Undid positive battery cable while running to check alternator status car died replaced altinator now start kinda acts like it wants but doesnt got spark fuel injectors?

Here are a few things that could be causing your car to act like it wants to start but doesn't after replacing the alternator:

- Spark Plugs: Check the spark plugs to make sure they are properly seated and not damaged. If they are old or worn out, they may need to be replaced.

- Fuel Injectors: Check the fuel injectors to make sure they are properly connected and functioning. You can try disconnecting and reconnecting them to see if that makes a difference.

- Fuel Pump: Check the fuel pump to make sure it is working properly. You can do this by listening for the sound of the pump when you turn the key to the "ON" position. If you don't hear the pump running, it may be faulty.

- ECU (Engine Control Unit): Check the ECU to make sure it is not damaged. The ECU is responsible for controlling the engine's fuel injection and ignition systems, so if it is damaged, it could cause your car to start and then die.

- Battery: Check the battery to make sure it is fully charged and has enough power to start the car. If the battery is weak or damaged, it may not be able to provide enough power to start the engine.

Once you have checked these things, if you are still having problems starting your car, it is best to take it to a qualified mechanic for further diagnosis and repair.