What Causes Weak Acceleration from 80 to 100 km/h?

[Dana]

The reasons for weak acceleration between 80 to 100 km/h are as follows: 1. Electrical system issues: Insufficient high-voltage ignition energy or irregular ignition, spark plug erosion or excessive carbon buildup, inaccurate ignition timing, oxygen sensor failure, etc. 2. Fuel system issues: Low fuel pressure, poor fuel injector performance, etc. 3. Mechanical issues: Insufficient cylinder pressure, restricted intake airflow, exhaust pipe blockage, throttle sticking, incorrect valve timing, poor engine cooling, etc. 4. Chassis issues: These may also affect vehicle acceleration, with common causes including clutch slippage, brake drag, low tire pressure, etc.