91 300SE M103, new injectors, now harder start

[sixto]

I replaced the injectors (injectors, o-rings, seals, holders) of my 91 300SE. Idle is smoother but still not glass. Smooth at speed but not smoother than before. The trouble is that were it used to stumble for a few seconds when starting cold, now it catches and dies a couple of times before it stays running. The stumbling part is either much shorter or gone (haven't tried enough times to know for sure).

I suppose I should check the accumulator and pump check valve next, but does stalling on cold start indicate something wrong with the new injectors or their installation?

Thanks,
Sixto
91 300SE
87 300SDL