Car doesnt accelerate as fast anymore

Khanxyz0z

Im in this weird situation, my z which has now 64k miles. Has its check engine light on, last time this happened i changed air filter and it went away, this time i took it to a local shop, thry tried changing like 3 things, air filter, intake and battery. But didnt go away,

I also want to say i wanted to trade it in to get e92 m3, so they told me they will reset and i can trade in, but im not trying to do that. I took it to a diffrent shop and they said its giving engine codes. I told them i want a solution that can fix it not just hit or miss tries here and there. Then they say the code is for maybe spark plugs, maybe coil(not suspension), maybe 02 sensor, 'since its an engine code they dont know which item to fix exactly.

I personally never really changed anything, besides doing oil changes. I dont know mabey there is some fluids i shouldve changed after 50k miles.

Lastly, one thig that happens to the car maybe once a week is that im even though im using paddles it doesnt accelerate, i fully step on the pedal but it will gradully increase speed and dont go over 3000 rpm, almost like im just rolling in nuetral at a really high speed when im changing gears, turn the car off for 3 hours and its back to normal. So i dont know if something realted to this causing the check engine light.

What i want to do is actually go to reputabile shop in the ny/nj area, and trying to avoid going to nissan dealership, which they were telling me that they wanna charge $250 just to diagnose, im like yea ok.