934runner exhaust issues

My 4runner when idling and when slowly accelerating, kind of "chokes" instead of having the smooth exhaust that you are used to hearing. Could I have a leak in my muffler? It looks okay though. Any other suggestions?

Take off the air intake hose from throttlebody and spray some wd40 lightly on a rag and clean inside of throttlebody where throttle plate closes with rag (do not just spray inside from can )