im new to the zs and i was wondering what the best thing to use to clean my injectors and even more broad my engine. does it even need to be cleaned. it has 180000 miles. i bought the 120 k kit and had it put on the car. i have cold air intake and today i put 100 octane gas into it. i also cleaned the throttle body sensor and the spark plugs. anything else i can do to help? i dont know what kind of care the car had before i got it but i want to know its clean and will run good. i also was wondering why its hesitates from 1000rpm to 4500rpm anything i can do to make it more responsive or have better accelatration?

 

seafoam and search.