i had the very same problem on my 1999 matiz,it was a broken wire on the fuel injector.(i'd changed the distributor cap,fuel filter,plugs etc before finding out it was this)hope this helps.
Mass Air Flow MAF sensor could be your, problem check that!
remove timing cover
The engine number on a Daewoo Matiz is typically located on the engine block itself. You can usually find it stamped on a flat surface or a metal plate on the front or side of the engine. It's advisable to check near the timing cover or the oil filter area for easier visibility. Ensure the engine is clean and free of obstructions for easier identification.
The transmission dipstick on a Daewoo Matiz is typically located near the back of the engine bay, often towards the passenger side. It is usually marked with a bright color, such as yellow or orange, to distinguish it from other dipsticks. To check the transmission fluid, ensure the vehicle is on a level surface, and the engine is running. Pull the dipstick out, wipe it clean, reinsert it, and then check the fluid level.
on the passenger side under glove box is the blower for the daewoo matiz check connections of the power cables
Check your front brake pads
To change the radiator hose behind the engine in a Daewoo Matiz, first, ensure the engine is cool and drain the coolant from the radiator. Then, access the hose by removing any necessary components that may obstruct it. Disconnect the old hose by loosening the clamps at both ends, replace it with a new hose, and secure it with the clamps. Finally, refill the coolant and check for leaks before starting the engine.
To add water to a Daewoo Matiz, you should locate the coolant reservoir, which is typically a translucent plastic tank near the engine compartment. Open the cap and pour in the appropriate amount of water or coolant mixture as specified in the owner's manual. Ensure the vehicle is cool before doing this to avoid injury from hot engine components. Always check the level regularly to maintain optimal engine performance.
The spark plug gap for a Daewoo Matiz is typically between 0.8 mm and 1.0 mm (0.031 to 0.039 inches). It's important to check your vehicle's manual for the specific gap recommendation for your model year, as it may vary slightly. Always ensure the gap is set correctly for optimal engine performance.
To replace the heater hose on a 1999 Daewoo Matiz, first, ensure the engine is cool and disconnect the negative battery terminal. Locate the heater hoses connected to the engine and the heater core; use a pair of pliers to loosen and remove the clamps. Replace the old hose with a new one, ensuring it fits securely, then reattach the clamps. Finally, reconnect the battery terminal and check for leaks after starting the engine.
you need to check the oil opening and caps to re-tight them again
There are more than 50 problems that will cause a check engine light to stay on. The most common reason is the circuit board needs to be replaced. The only way to know why the light is on is to run a diagnostic test.