Sputtering when in drive.

is the engine light on and do you have any codes?.....it sounds like the fuel pump is bad or fuel pressure problem...I would have the fuel pressure tested on it and if engine light is on it should be scanned

No codes no engine light and yes fuel test was done.

Already did the Seafoam and helped for a couple of weeks. It seems to really sputter when its on a slant.

I had an issue with my 1999 TJ stalling when I came to a stop. If I put it in park quick enough it wouldn’t stall. Ended up being the transmission. I put in a bottle of Seafoam Trans tune. Issue went away almost completely. Then after driving a few hundred miles got a trans flush. Jeep is running great.