Hello all, I replaced my battery today and while driving noticed the car seemed a little "sluggish". I had my ECM tuned a few years ago by PCM4less and currently have modified the exhaust (header and cat). I have read that disconnecting the negative terminus from the battery for a period of ~30 minutes will clear the ecm. Is it reasonable to presume this has occurred with my ecm? That is, the disconnect has cleared/deleted the tune and is presently "re-learning"? As always, any and all input to the matter is welcomed and appreciated.