Hey whats up guys I just bought my 240sx and it has the sr20det engine swap. it was running good for the first month but then it started to have this really bad problem. I would start drivin and it would be ok but all of a sudden it would start to sputter alot and then it would just stall out. Here are the mods that I have on the car. Greddy FMIC, Greddy RS BOV, Greddy manual boost controller, greddy intake for the turbo, custom exhaust manifold, jdm exhaust system with 3 in piping from turbo, apexi afc, and exeddy stage 2 clutch. I took my car in to the local performance shop and at first they said that it was my maf sensor that it was burnt out and that I should get one from a 300zx installed so I did and its still doin the same thing so then they said that it was the apexi afc that was messin up so they removed the wiring from the ecu so that it would run off the stock settings and it will run good at idle when the car is just cruzin but once it goes into boost it just dies. After that they said that they dont have any idea what it could be so Im really lost now. I hope that someone can help me out *** this shit is really startin to get on my nerves so if anyone could help me out with my problem I would really appreciate it. thanks.

You can't run a 300ZX MAF with stock ECU. You should try running with all stock engine management and see whether that helps - stock injectors, MAF, and ECU.

You didn't mention injectors or turbo up there, so I'm assuming you have stockers. There's NO point in my opinion if you're running the stock turbo to have bigger injectors or MAF.

I tried like u said with everything stock: ecu, maf sensor, injectors, and all and it still does the same thing. do u think it might be the ecu or maybe a boost leak?