Buick Excelle 1.6 engine speed is unstable and acceleration is weak.

Hello, there are several possibilities.

1. The spark plug gap is too large, and too much carbon deposit is not conducive to ignition, so the spark plug needs to be replaced.

2. The high-voltage line or ignition coil leaks, and the ignition energy is not enough, so it is necessary to replace the high-voltage line or ignition coil.

3. The pressure of the oil pump is released, which leads to the failure of high-speed oil supply, and the oil pump needs to be replaced.

4. The three-way catalytic converter is blocked to some extent, and poor exhaust will also affect the power. You can clean the three-way catalyst.

5. The air filter is too dirty and the air intake resistance is high, so it needs to be replaced.

I hope my answer can help you. Have a nice ride! If there is something wrong with your car, ask the car mechanic. 4S shop professional technician, 10 minutes to solve.