ever since I've had my 1jz (jzx110/jzs171) in my Cressida (mx83), I've noticed its been sluggish after it gets to operating temp. To be more specific, it will pull thru full boost if it is not warmed up. Other than a custom 2.75 Inch intake/maf pipe, a Cx racing intercooler kit (stock bov is bio added) and a walbro, it's is 100% stock. As soon as it's get 1/4 of the way to op temp, it's will hit a gnarly fuel cut around 1/2 throttle in higher gears. Once operating temperature is reached, it's becomes sluggish like it's not getting enough gas, and does not seem to be boosting above like 5lbs (this is a guess, I am not running any guages yet). Any things helps!