Car’s rpm fluctuates to 4000 rpm after starting

Hello, sounds like an air intake concern - a vacuum leak or unmetered air leak. Hands on evaluation is needed and the problem should not be too hard to find for a professional. Hello, what happens if you put the tires and rims that were on originally back onto the vehicle? If the wobble disappears, you know you have a problem with the new rims and tires. Geometry can change and laws of physics can explain frequency differences that can cause vibration. If your wobble is at a specific speed, it could be as simple as a bent rim or out of balance wheels. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops