check the wires, injectors, make sure the new plugs are gapped correctly also check the throttle position sensor
did the check engine light come on? that is the best way to tell whats wrong with the car is to scan the codes and see what the engine code if any were thrown. other than that it could be any number of things. i dont want to scare you, but the tp sensor can cause a miss, but there is also the crank shaft position sensor, which could be faulty, or the camshaft position sensor, which ever the vehicle has. faulty mass airflow sensors and manifold absolute pressure sensors could be your problems as well. but without knowing if the check engine light is on and if there is a dtc present, you would be throwing parts at and not fixing the problem, which would end up costing you alot of money.
Looking for a Used 4Runner in your area?
CarGurus has 29,409 nationwide 4Runner listings starting at $1,500.
Search Toyota 4Runner Questions
Toyota 4Runner Experts
Related Models For Sale
Used Cars For Sale