I recently put a new muffler on. Just cut the old one off. I did the seafoam treatment. First through the powerbooster into the manifold. Crazy smoke for a while. Then added a little to the gas tank after a fill up. Ever since I have been getting a rough idle. I even had a check engine light come on while idling a nd running the ac. I have no clue what is going on. I disconnected the bettery and let it reset. Figuring it would relearn and stop the rough idle but still to no avail. Does anyone have a clue what the problem is? I dont know what to do.