When i first purchased my Vr4 it was a rocket and i had planned to do whatever maintenance i needed to do to make it healthy. so far ive replaced spark plugs, air filter, timing belt and water pump. trans fluid and filter changed. overtime it feels like it’s lost power and still declining. i’ve suspected that the fuel filter may need changing cause i was driving one day and i gave it gas and the response time before rpm’s went up was a few seconds more then it should’ve been. are there any common issues or maintenance i should know i need to perform that could alleviate this issue im having