Q: I need to figure out whether to replace the gasket to my turbo or if that is not the problem for excess air flow to my turbo.

My check engine light has been on for a couple hundred miles now due to excess air flow to my turbo because i have a 2002 1.8t. i tightened the bolts to my turbo and it seemed to have temporarily fixed the problem and quieted down the rattling, and it always shut off my check engine light but when i plugged in my code reader afterwards, it was still saying there was excess air flow to my turbo and i had noticed a blackened color around the seams of the gasket to my turbo which led me to believe it may be my gasket acting up, because i have slap shift and even driving automatically my car sounds like it is not shifting correctly and it is pulling too much power from my turbo to my battery and either completely drained my battery or is on the verge of it, my car needs jump started and will not stay charged. please help.

My car has 172400 miles.
My car has an automatic transmission.