rpm gets stuck

Hello, Why are you trying to make the engine speed higher than 4000 RPM when parked/ that very well could be normal - the engine has a rev limiter that prevents engine speed from being excessive when not in gear - in park or neutral. P2101 does pertain to throttle, but first share what you're trying to accomplish here. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.