I have replace that one

 

I didn't find excessive oil in the intake manifold. Also did a vacuum test from youtube without a gauge and it seems fine.

 

Did you solve this issue? I have a 98 5.9l magnum that's literally doing the same thing to me. I've replaced the spark plugs, spark plug wires, cap & rotor, OEM crank sensor and pickup coil, the EVAP canister and charcoal canister, both O2 sensors, checked for plenum leak.... Nothing on all counts. I even replaced the safety neutral switch to address the issue with my reverse lights staying on with my night time taillights, which still didn't fix a thing!
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What spark plugs did you install? What brand O2 sensors?

 

Bosch O2 sensors and NGK plugs

 

Ditch the Bosch O2 sensors. And if those are platinum/iridium/whateverium plugs (not standard copper), ditch those too.

 

That's not true at all because I just replaced both pickup coil and put in a "Genuine Mopar crankshaft sensor" just 20mins ago and it still is doing this sputtering and backfiring crap around the same RPMs...
So what else could it be? Because, I literally replaced everything single thing the original poster replaced as well, and it's pissing me off big time! Granted that my 98 1500 RWD has a 5.9 but there practically the same.
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Still have the Bosch O2 sensors in there?

 

No Napa's OEM O2's

 

Do you have a OBD2 scanner? If so, what stored or pending codes are you getting from the scanner?