Originally Posted by Taewrx
So what would you recommend to start with besides what I have listed? O I forgot to mention I have a Grimm speed boost controller would that effect. Anything
If it is in interrupt mode, it could cause overboosting, but, otherwise, an aftermarket bcs (or MBC or EBC) will not cause fueling issues.
Any leak post-MAF sensor and pre-front O2 can cause fueling to be off (and therefore impact fuel trims). Other possibilities are a bad MAF sensor, bad front o2 sensor, or using an aftermarket intake that the map is not designed for.