i have a d15b1 with a mpfi swap right now and it is in a 91 hatch. since the car doesent have a tac so im not sure exactly what rpm my motor starts to bogg down but im thinking its after 3k and before 5 or 6k. and after we did the swap it ran great for a few days. now i cant do a burn out or launch, it just bogs down and has a really deep sound. but i can drive it around town all day as long as i dont excelarate to fast but thats no fun lol. it feels like it may not be gettinbg enough fuel? but im not sure as i am still a noooob. but the timing was out a lil and got it back on track but it still boggs down.