Mg7 failed to refuel at 2600 rpm. What is the reason?

This situation may be caused by carbon deposition in throttle, idle motor, air inlet and combustion chamber; There is also insufficient acceleration when driving in urban congested sections for a long time; If the engine oil used is of poor quality, it will affect the service life of the three-way catalyst in the exhaust system. If the three-way catalyst is blocked, it will directly affect vehicle acceleration and increase fuel consumption. It may be that the sensor failure leads to the phenomenon of weak acceleration. This requires a comprehensive inspection of the engine.