I just put a new 2.4L motor in my Z24. Went to start it up, and it took a bit, which seems right since the motor was never started for months. After a while, it fired right up. It idles perfect. The A/F is right around 14.7 at idle. Then as soon as you hit the gas, the A/F goes lean and the motor sputters and dies. If you floor it, it will almost die, but then it will come back and go wide open. If you hit the gas VERY slowly, it will climb without dying. But any quick throttle response, and it dies. I have the GM S/C with the S/C injectors, and my pressure gauge on my fuel rail shows 60 psi almost all the time. What's wrong???
2010 Subaru Impreza WRX Limited
1999 Cavalier Z24 Supercharged
1999 Grand AM SE (Beater Car)
1997 GMC Sierra
2007 Honda CBR 600RR
2005 Honda TRX450R
do you have the reflash? if not, thats why you need it
LE61T PTE6262 Powered 
No, it's a '99. I never had the reflash when I had the old motor and it ran fine.
2010 Subaru Impreza WRX Limited
1999 Cavalier Z24 Supercharged
1999 Grand AM SE (Beater Car)
1997 GMC Sierra
2007 Honda CBR 600RR
2005 Honda TRX450R
I didn't change a thing with the setup on the new motor compared to the old motor. The setup is EXACTLY the same. The only difference is I put the secret cams in the new motor. Otherwise the fuel setup, ignition setup, spark setup, its all the same and the old motor ran without this problem.
2010 Subaru Impreza WRX Limited
1999 Cavalier Z24 Supercharged
1999 Grand AM SE (Beater Car)
1997 GMC Sierra
2007 Honda CBR 600RR
2005 Honda TRX450R
(hey, when i posted, i seen just QBE'S reply_)
Team GREEN
talked to brian- he said make sure the fuel injector wiring harness is plugged in all the way tight.
and check the fuel injector harness's also.
Team GREEN
Well, problem solved. I disconnected the MAP sensor and then it ran just fine. So I plugged it in again, turned the car off, restarted, and then it seemed to be fine. Hopefully it stays that way.
2010 Subaru Impreza WRX Limited
1999 Cavalier Z24 Supercharged
1999 Grand AM SE (Beater Car)
1997 GMC Sierra
2007 Honda CBR 600RR
2005 Honda TRX450R
I was thinking your throttle position sensor on your t/b.
