Car Problems- MAFS?

[nissandrift]

My car ( 1993 240sx SE w/ stock KA24de) was having problems stuttering about 2 weeks ago, anyways the next day it pretty much dies. It dies every time I try and give it gas, but start and idles fine. I unplug the MAFS and it runs fine until 2500, just a little rich. I figure its the MAFS and its runn9ing in safe mode. Well anyway i check voltage on it and its getting 14.5 volts in and putting .37 volts out when plugged in. Anyways I buy a used MAFS and it got here today. When I put it all back in and plugged it up my car does the same thing. I figure its worth a shot to unplug the negative battery cable and maybe reset ECU, I know its needed with OBD2 but unsure with OBD1. Im wondering do you think I got a bad MAFS, or does the problem lie elsewhere? Does anyone have and S13 in the johnston, or wake county area that would let me borrow theres for a bit so I can try your MAFS? Im willing to pay a little.

[240slider]

check the EGR valve it could possibly be stuck open which could cause the stumbling and rough idle .but also check and see if your air fliter is clogged .and pull the spark plugs to check and see if if you have flooded the cylinders with gasoline if so clean them check the gap and seat the back in properly .I hope that works for you .

[nissandrift]

I've gapped the plugs, and Im getting code 12 on the ECU. I've read that it means MAFS. I've tried 3 different MAFS, and no luck. Yesterday I tried to piggyback the ground wire, but Im not positive that I did it right. Its idling fine, just won't rev past 2500 with the mafs plugged or unplugged. It runs to 2500 regularly with it unplugged. But when its plugged up it likes to die, but sometimes if you work with the throttle itll rev to 2500 or so.