So, been having issues the last week. Happens in every gear. It accelerates normally until around 2000rpm, there it seems to lose tons of power and hesitate a bit until about 3400RPM when full power comes back on. It is not torque converter as i tried pressing break to disengage it and it doesnt help.

Just put in new Fuel filter and out of ideas.

Also, not sure if this is related but I bought car 6 months ago and ever since I bought it after driving and stopping at light or after parking the Exaust system makes a ping ping ping sound for like 5 minutes (sounds like metal expanding/contracting)

Car has approx 90,000 Miles on it. No check engine lights.