when the car is nuetral it revs up fine and works great... but when the motor is under a load the car jus like cuts out and bucks rediculously when it gets to around 3000 rpm or right when it starts to boost... it doesnt buck like a boost leak its liek somthin jus isnt right... WHATS GOIN ON??

 

you have a leak and or your timing is off

 

i have had boost leaks before and the jus make it buck a little this is like complete shut off almost i mean it will not go past 3000 what so ever... and yea the time is off but it doesnt seem like that would effect it this much... I jus recently replaced the MAF and went to the z32 could it have somthing to do with that????

 

you might need to replace the knock sensor or adjust base timing, in either case if the timing is too agressive and knock is detected the ecu will compensate by pulling a significant amount of timing under medium to high load. could also be signs of fuel deprivation

 

when you added the Z32 mafs, what are you using to compensate for it?

 

make sure its wired like so. disregard the JWT disclaimer... ill post another diagram when i get home.

http://jimwolftechnology.com/wolfpdf...%20NISSANS.PDF

 

I just noticed you replaced the mafs with a z32 unit. You might have to buy an afc and play with the in and out settings so the ecu detects the propper voltage and gives fuel accordingly. without any kind of compensation it is likely that your car will run quite lean.

 

hmm I overlooked the missing afc,,, you will def need something to help your ecu along. the only way that you can get away without running an afc for long is with some sort of ecu rom tune such as JWT ( Jim Wolf Technology) etc.