sr20det sputtering after driving for awhile

[terrence]

I just swapped this motor (s14 sr20det) over and everything runs dandy except after driving it for 10 minutes or so then it starts stalling and sputtering. The car has a new wiring specialties harness, new to me MAFS, stock fuel pump and stock injectors. Everything is stock on the car except for a front mount, tubular manifold, and HKS bov. Car idles fine cold but I guess it does this shit after it warms up.

Any ideas?

[OnTheChip]

Could be the O2 sensor.

[terrence]

Could be the O2 sensor.

Yeah, I read that on CN too...

[ultimateirving]

What chassis? and stock fuel pump should be changed out for SR

[terrence]

What chassis? and stock fuel pump should be changed out for SR

1995 s14; a stock sr one or 255? Why would it take until the motor got warm for the pump to decide it can't keep up?