From the sounds of things, dude you have 101 problems that the interwebs cant fix.

Stop reading things on the net. Trial and error will cost you.

Take her to a proper shop and tell them whats happening and to have a sticky beak.

Before its too late. Get ready to spend ~1k on a major service from the sounds of things.

I just have a good feeling, your playing "Catch up services" due to previous owners abuse and lack of caring.

You have a car that's used. Sure you love her, but how far are you willing to go?

Shes already been trashed, use her, have your fun and move on.

Not too mention, your reving to 9k on cold start.