Anyone figure this out? My 2004 ram 2500 hemi will drop rpm to about 500 then pick up and drop from about 1000 rpm to like 200 rpm then stall. Only happen when slowing down or stopping. It has a brand new throttle body, new crank sensor, new evaporation leak detection canister as well. It’s catless with a 40s series muffler. I’ve changed all 4 oxygen sensors. What will it be???

 

Is there a way that you can check how well the fuel is going through the system? If that's not the issue, then it could be something like the spark plugs. If you replace the plugs at some time in the future, make sure to only use copper plugs.

 

It’s not the fuel system because it idles and drives fine it’s only when I’m slowing down or coming to a stop. It’s will drop rpm and pick it back up or sometimes drop rpm and die. I was told it could be the lack of back pressure where it had no cats or muffler

 

Yah clogged cats could be a possible issue. If you can have someone use a boroscope, that will tell you whether or not everything is functioning properly in the cats.

 

it’s catless so that’s not the problem.

 

Clean the throttle body.

 

it’s a brand new throttle body

 

What brand?

Did you reset the PCM after installation?

 

yes I did and not sure it was $300 at orileys

 

Hhhmmm...... Don't put much stock in the over the counter parts places...... Especially for things like that, and the crank sensor. If it isn't mopar crank sensor, I suggest trying that first, and maybe trying for a warranty swap on the TB.