I changed the oil filter and spark plug, cleaned the accelerator and changed the brake oil. Now there will be abnormal jitter when the car starts. What is the reason?

It is estimated that there is something wrong with the ignition coil. If the spark plug is not coated with insulating silicone grease when replacing it, it may creep slightly. As for the replacement of the rubber sleeve or the whole replacement, we can consider it. 70,000 kilometers is also conducive to integration and replacement. If you still want to save some money, replace the rubber cover first and coat it with silicone grease. If not, replace the whole. The rubber sleeve is only 60, and the ignition coil is 300 to 700.