Just washed the throttle and intake manifold, why is the cold car still shaking and running?

There is detergent residue after cleaning. It is normal to start chattering for the first time, and it will not happen after residual combustion.

In addition, you can check whether there is a fault light, whether the lower intake pipe is installed in place, whether the plug contact of the air flow sensor is good, and it may move to these places during cleaning. If it still shakes, check whether there is any problem with the intake and exhaust solenoid valve, spark plug and ignition coil.