Chevy Tahoe 2000 5.7 engine i have instilled a procharger supercharge the problem is that when you accelerate the check engine starting to plink and when you slow down its stop blinking?

you need to be running premium. i would guess that you are not. your motor is experiencing severe knock caused by the boost. this causes the pcm to freak out cuz your motor is going to blow if you keep doing this.