about injector cleaning !! no idling

friends I poured the WÜRTH injector cleaner into my vehicle every 5,000 thousand pours it to the tank. why do you think? I do not think it will be from the throat butterfly ... I changed the idler orj 2 months ago, the potential meter has just changed, the supplier industry is obliged o & nbsp; what could be the problem .. easy thing but what & nbsp;

There can be many reasons. The first thing that comes to my mind is the map sensor or vacuum leak.
Does the vehicle stop during this surge? Did this happen before using the injector cleaner?

this incident did not disappear without the cleaner pouring, it has returned to normal, but the slight ripple continues.