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So I bought an EFI Live autocal and had the tunes written for LBZ FPR. Installed the regulator and flashed ECM and it idles smooth right when I start it, but after it idles for a short time it starts knocking and loping. Once I give it a little throttle it smooths out.

I hooked up my autocal as a pass through and actual fuel rail pressure is way higher than desired until I touch the throttle and then it balances out to exactly what is desired.

After the first FPR I installed and it did this I tore back into it and put another brand new Bosch regulator in and also replaced the wiring to the regulator. I also put a new MAF sensor in. I’m out of ideas and hoping someone else knows what’s going on. I guess my next step would be the Fuel Pressure Sensor... I also have an air dog LP and have adjusted the pressure and it hasn’t helped.
 
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