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It sounds like your car is experiencing some issues with its engine performance, particularly during low-speed acceleration. Since you've already checked the spark plugs and tried using higher-octane fuel without success, here are a few other potential causes to consider:
Fuel System Issues: The problem could be related to the fuel injectors, fuel filter, or fuel pump. If the injectors are clogged or the fuel filter is dirty, it can disrupt the fuel flow and cause hesitation or jerking during acceleration.
Air Intake System: Check for any obstructions or leaks in the air intake system, including the air filter, throttle body, and intake manifold. A dirty air filter or vacuum leak could affect the air-fuel mixture and cause performance issues.
Transmission Problems: Although you mentioned that the issue only occurs during acceleration between 1000-2000 rpm, it's still worth considering the possibility of transmission-related issues. Check the transmission fluid level and condition to ensure it's within the proper range and not contaminated.
Ignition System: While you've already checked the spark plugs, other components of the ignition system, such as the ignition coils or ignition control module, could be malfunctioning and affecting engine performance.
Sensors: Faulty sensors, such as the mass airflow sensor (MAF), throttle position sensor (TPS), or oxygen sensor, can also cause drivability issues. Consider having these sensors tested or replaced if necessary.
Since the problem seems to be intermittent and doesn't trigger a check engine light (CEL), it may be a bit more challenging to diagnose. If you're unable to identify the issue on your own, it might be best to consult with a professional mechanic or technician who can perform a thorough diagnostic assessment using specialized tools and equipment. They can pinpoint the exact cause of the problem and recommend the appropriate repairs or adjustments to restore your car's performance.
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