After replacing the throttle, the idle speed is high. Is the jitter in D gear normal?

Normal. Because the original throttle is dirty and has carbon deposit, the new throttle has a large opening and a large air intake, which will shake when the idle speed is high. In general, after clearing the throttle, the decoder needs to match the throttle. This usually happens if there is no match. If it doesn't match, it's fine, but after driving for a few days, it will be fine. Ecu needs a step-by-step learning process.