lilgambino

I have a 87 TII with a microtech LT8,Master Power .70 trim,aeromotive a1000 pump and full 3" exaust w/apexi n1,v mount intercooler. The car runs pretty good boosts well except i need to tune for more fuel it runs lean.When i step on it the car stutters and starts to go lean then comes back.Any suggestions?I believe i have stock 550 injectors.I dont own a wideband but i know it runs around 14-13 AFR.Thanks for your time.