Daewoo 1.5i 1994 model, BIG problems... HELP!
In the old days, you could take off the air cleaner and pump the throttle and see if it squirted gas in the carburetor or pull off a spark plug wire and crank the engine and look for a spark. You can still make those checks, but without a carburetor or spark plug wires, it requires more disassembly. After the engine quits, pull the fuel injector or fuel injector rail and see if gas squirts out when you crank the engine. Don't let the gas spray anywhere it will catch fire. With direct ignition, you can pull the whole assembly off and see if there is a spark from the coil contacts when you crank the engine. Often as the coils age, they quit working when hot, or the module that feeds the low voltage pulse to them does. The output of the module can be checked with a test light or meter. These things are a pain to find, but do your best.
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