So far so good, no check engine light coming on, engine seems to be running more normally now. Thanks for all the help.
But now I'm noticing quite a lot of drop from the tail pipe, and I haven't seen it drip at all before. Not a clue what this means.
And I have another off topic question since I can't seem to find the answer anywhere, I'm not sure how to read the transmission fluid dipstick. There's just a hole, a circle, then it dips in and reads hot or cold. There's no obvious indication of what is max or min, to me at least.