Toyota: STP Concentrated fuel injector repercussions, air passages, gas mileage

Question
I used STP concentrated fuel injector gas additive 5 tanks of gas ago on my Toyota 1.8L.  It took 3 gas tanks of gas to clear out the additive which had caused engine missing while it did its job.  Now my gas mileage is better than ever!  However, now at idle my car stalls; and the engine bucks more wildly the more rapidly the accelerator is depressed at any speed.  Could the cleaner have dislodged gunk from the tank or fuel line and deposited it into either the fuel filter or some smaller opening further down the fuel line?

Answer
Hello. You probably need your throttle body cleaned. There is always some carbon removed when you use STP, and it can get deposited on the throttle plate, or clog up the idle air passages. Best solution: HAve a pro remove and completely clean your throttle body assembly.