My friends got an sr20det in an s13 and we were drivin around today and it was boosting good and all then we stopped somewhere and when we got back going it was kinda hesitant. Its boosting but not going anywhere at all. It kinda feels like its studdering/hesitating. Also its boosting like 5lbs at 2500rpm's and before it wasnt barely boosting at all until about 2900rpm's. Anyone know what is wrong or could be wrong????