When I give it just a little throttle, my fuel pressure gauge shows a "bouncing" movement and the car starts to lurch and stumble. This is under light throttle only, and is not enough throttle to boost the turbo. What is this, and why is it happening? Any input is appreciated as I'm really starting to get frustrated with everything. Thanks.

 

just guessing here..

but are your injectors clogged a little?
fuel pump working ok?

 

i would assume that its just fluctuating vacuum acting upon the regulator.

 

I don't get it. What's really weird is that at idle it stays steady on the gauge without bouncing and under boost it also remains steady after rising significantly. I'm running stock injectors, so I don't know if this is a sign that I should switch, and if so, to what, RC 370 injectors?