I think the jumpy idle might actually be my brake booster dying on me. I'm in the Midwest so it's just now starting to get cold, and I've been hearing hissing when it's cold. I haven't checked it out for certain; burst a hose somewhere on Christmas Eve and I was spraying a small shower of Coolant. It looks like the leak is coming from where the coolant attaches to the driver side of the engine block, underneath the air intake. I can't see for sure though because it's in a shifty place. I work at a dealership and get discounted work so I might just take this one to them and let them find it. Just keeping it topped off with coolant for now, it's not leaking too bad but it'll only get worse. Sorry environment �� so that's my #1 priority for now. I'm going to use an injector cleaner once my tank gets low, I haven't had many instances of misfires, just here or there only when the engine is under heavy load. I love my car to death but she sure is testing my patience. I still have a bunch of suspension work I need to do. And still the list grows