Hey, I have a '78 280z, with a fresh l28et and ms3.
I recently got it running and decided to put a walbro fuel pump, aeromotive afpr and aftermarket rail on it.
I got the car driving around with a decent air to fuel ratio. It will hold a solid 40psi for a while driving it and all of the sudden it drops as I get into boost. I'll be driving the car and all of the sudden it leans right out as I put the pedal down. Even just revving it in my driveway it drops off from 40 to 0 in about 2 seconds.
The pump seems to be fine but does start to whine a tad more as this happens. I have it wired to the stock setup. I have also bypassed the whatever valve is beside the stock pump.
It seems happens intermittently and I don't know why.
Any help would be much appreciated!