91 Skyline Gtr Fuel Cutting?

[RB26DETTSMALLZ]

Ok I have a 1991 Skyline GTR with the RB26DETT motor and I am having some issues with the car. It all started when i first bought the car it had a cheap-o aftermarket intake and cheap-o blow off valves, which made the car run goofy ( rough idle ) , so i trashed the aftermarket intake and put the stock one back on and left the bov's the same. Here is where I encountered the problem.. I took it to a local shop and they said that one or both of the MAF sensors was bad so i ordered used ones from japan and put them on and it still didnt solve the problem.. so now when i get into boost a tiny bit like around 2500 rpm its almost like the car is fuel cutting..it jolts back and fourth so i have to keep it in a high gear to get anywhere.. even when i push in the clutch and push the gas pedal it wont go past 3000 rpm and it sounds like it has a 2 step rev limiter but i know for sure that it doesnt.. it started out only doing it every so often but its getting worse and worse..my thought it that it may be the fuel injectors? because it used to fuel cut when i was into high boost..here is a short video of what it is doing..

[Hadouken]

I like the little scream for help haha.

Afm's, plugs, coils

[RB26DETTSMALLZ]

checked the plugs and coils..they are perfectly fine the maf sensors are new/used just put on maybe its the wires to the afm??

[RB26DETTSMALLZ]

and it only does it when it is warm..when its cold it runs flawless

[Hadouken]

Im still thinking afms man.

Try unplugging them one by one and see if the car will rev better.

[Bronx]

should be afm, the 2500rpm is a safety measure if the afm voltages are playing up or they are broken. or even if you put z32/q45 afms in with a non compatible ecu.

replace em with a different pair, (borrow someones for a quick exchange) and im 99% sure it will fix that problem.

[mad082]

yeah it's going into limp mode. generally caused by an issue with afms. maybe try checking fault codes and see if that shows anything up

[West]

Looks like faulty AF.

Check the DIY forum, there is a thread of how to fix them, from memory its like a wire that need to be re-solder again ....!

[cabramatta]

I had the same issue, and didn't have any codes thrown at me (55 all good).

I had removed the AFM and opened it up and re-soldered the joints inside.

This got rid of my problem.