about a week ago this started happening . got the mevi on and everything was fine. but about a week later between 2500-3000 rpms if i apply gas the car starts to feel like it stutters until i pass 3000 rpm and if i come down from lets say 3500 and let it coast down it will do a jump from 3000 to 2500 instead of coming down 3000,2900,2800,etc... not all the time. my friend just put my triple pillar guages set in and one of the guages i have is for vacuum. with the car in park i get 25, when putting it in drive it goes does to 22-21 area, and when i apply gas it goes down to 15 until i let off then it will go back to 25. if i step down on the gas all the way it still gives me that stutter between 25oo-3000 rpm and the guage reading goes all the way down to 0 and when it shifts gear it goes to about 5 and not higher until i let off the gas. i have my vacuum guage tapped to the mevi's vac canister.is the problem something having to do with my fuel pressure regulator? its been happening every since i put that bottle of fuel injectiont cleaner in my tank