When i hit the gas my car excelerates then lags then excelerates again. I watch my vac.boost gauge and when i hit the gas it starts to pull it out of vac and i get exceleration. Once my gauge reads 1psi the car laggs WAY down untill it reached 5psi then i excelerates.. Is this normal?

 

do you have an air/fuel ratio guage? you might be running lean at those rpms. what fuel mgmt do you have?

 

could it be leaks somwhere in the charge-pipes, my brother has a 300tt and it did that, the stock pipes were rubber so he switched to hard pipes and it fixed the problem.

 

check ur tps sensor

mine does the same and im not boosted
it boggs for 1 second and continues to accelerate