Injectors sick?

[Chief]

I have a Fiat L-jet and it seems to be a little sluggish sometimes at lower
rpms, picks up around 3500 or so.  Can't really floor it or it cuts out.  Is
it possible the injectors are working well only in the mid-range rpms and
not at low or high extremes.  Is it common for injectors to have this sort
of pattern or is it maybe something else?

Also, what would be the likely cause of cold drivability problems with the
L-jet system?

Ed Hilker aka "Chief"
84'SS - 700R4