You are probably correct but I wouldn’t jump to PCM immediately. If your battery is not new, I would try a new battery.
I would also be looking at the fuel pump as mine went a little while back and had some similar(ish) issues as yours.
I put an aftermarket one in and it works again but the fuel gauge stopped working. I found a new oem Bosch unit on Amazon which I will one day get around to fitting. Amazing how poor some of the aftermarket gear is.
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Jeep TJ rebuilt 4.0L, Custom Steel Roof Racks, vintage ((Jeep specific)) 15” Centerline Hellcats,
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