stumbling beretta

[latemodelnewbee]

I'm working on a 95 Beretta with a 3400 and 282 swapped in to it. The problem I'm having is when its warm and traveling at descent speed it stumbles like its out of fuel when I try to accelerate, it goes away if i back off the throttle to a cruising speed. I have only heard of fuel pumps working or not working never heard one hiccupping before. I haven't checked the pressure yet I'm trying get my hands on gauge. also if the regulator is bad will the one from the 3400 fit in a small port 3100 fuel rail? I forgot to mention this is not swapping problem we have been driving the car around for about a year with this set up, just this problem has me baffled

[1meanz]

not sure what to tell you on your stumbling problem but i do know that the fpr from a 00+ 3400 will NOT work with a small port, at least it didnt with mine. i couldnt get over 3k with the 00+ fpr in mine.

[latemodelnewbee]

I found out that the 3400 fpr wouldn't work the day after I posted that, I finally found it hidden in my garage but thanks any ways 1meanz.
It has appeared to be a mix of many things, the pressure was low and slow to react, so I replaced the pump and filter that fixed that problem. The cooling fan wouldn't come on with out using the A/C, I replace the relay and the temp sensor. I know the works when I turn on the A/C the fan comes on immediately. I still using the Beretta 2 wire temp sensor so I don't know exactly what the temp in at, but i can tell when the thermostat is opening. I wanting to do the 3 temp sensor when I replaced it but i didn't have a pigtail to wire in.