wither48

Hey all,
I have an s13 with a ka24de in it. Car has been running badly and missing regularly (I can reproduce symptoms when it's running well if I unplug an injector). I have adjusted base ignition timing to as close to 20° btdc as I can and vacuum at idle with ac on is usually around 20" of Mercury. Recently did a new cap and rotor, plug wires, air and fuel filter, ignitor and plugged up a few vacuum leaks. I have a slight crack in my pcv hose at the pcv (the clamp covers it) and old vacuum lines but I don't believe I have any other leaks yet. Car likes to idle high sometimes and when it does it runs real smooth, only missing when it hangs out around 1k or lower. Thinking it's an iacv but not sure. The motor and car have dubious history at best
Thanks y'all, any help would be a godsend

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