Porsche Repair Questions? Ask a Mechanic for Answers ASAP
Hello! My name is Gary.Welcome to JustAnswer.I'm reviewing your question now, and will post back with a reply shortly.
At 98000 miles, I would say you are approaching an engine rebuild.
A cylinder leakdown will confirm this.
Of course if you want to go this route, some mild mods, especially ported heads will lift performance.
Do you need any further help?
I hope my advice has been of assistance to you.