Miqmiqmiq

After nearly 2 months of guessing what's been going on, and numerous shops ripping me off. I'm taking the chance, and tackling these issues on my own(with the help from the forums as well)

I have new spark plugs, the correct ones. Now I'm turning the focus to either replacing all 4 of my coil packs or finding the (large) vacuum leak(s). After reading cause for either, I'm confident enough that either one if not both, are the issues.

My xb has around 98k now, has anyone else had these issues around this mile range?

Any advice, tips, how-to go about tackling these concerns would be great. And if I need to replace the packs, any suggestions/links to quality packs that you've used would also be appreciated.

Thank you in advance.