Low Power

Several things can cause a car to die. The fact that you don't have any engine codes eliminates some of them. First thing you should try if you haven't is change the fuel filter. Make sure there are no damp, or damaged electrical components. It could be faulty spark plugs, or wires, or a vacuum leak. Check carefully under the hood for vacuum leaks. With the engine running, wiggle all the vacuum hoses around and check for cracked loose or broken hoses. They will make a hissing sound when you find it. A stethoscope, or a length of fuel line held to your ear can help a lot. Check all intake bolts for tightness too.

https://www.fixya.com/cars/t15700594-2004_suzuki_forenza_lose_power_while

https://www.suzuki-forums.com/threads/low-idle-stalling-power-loss.135369/

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