RB20DET Spitting and sputtering

[Project_RaceBreed]

I have an rb20det that i installed a few months back, For the most part it is stock except for the FMIC, my problem is when it hits about 5 psi to max boost it spits sputters and pops until i let off the boost guage shows its got boost but it just seems like the motor is on its own. I thought it was the fuel pump so i installed a walbro 255 and still no change so im asking here to see if any one can help me with the problem. I changed plugs in april so i know its not there just help because its a pain.

[s13silvia123]

my guess might be boost leak. cause that happen ta me a few times look for the leak.

[Project_RaceBreed]

But wouldnt the guage act funny?

[tiresmokes13]

Could be a couple of things fast easy things to check. Boost Leak, Spark plug gap, Pull your plugs out and make sure they are still in spec.