What are the reasons for the Buick GL8 shaking during acceleration?

[DeAmir]

Buick GL8 shaking during acceleration can be attributed to the following reasons: 1. Poor ignition: After driving a certain mileage, the ignition capability of the spark plugs decreases. During acceleration, weak spark plug firing can lead to poor combustion and shaking. 2. Insufficient fuel pressure: Use a fuel pressure gauge to check the gasoline pressure. Observe whether the fuel pressure keeps up during rapid acceleration. If not, inspect the fuel pump and fuel filter. 3. Poor fuel injection: Check whether the fuel injectors are spraying fuel properly and whether there is poor atomization or insufficient fuel injection. If so, clean the fuel injectors. If the problem persists after cleaning, replace them. 4. Incorrect ignition timing: Ignition timing controls the firing moment of the spark plugs. Use a computer to check whether the signals from the camshaft position sensor and crankshaft position sensor are normal, as well as whether the ignition timing is correct.