1990 RRC 3.9 engine rough Idle/stall

Swedjen2

Well-known member
Sep 12, 2018
552
111
California
Well, for the last 4+ years, the engine has been running virtually without a hiccup. It's been parked for a couple weeks, 1/4 tank of gas.
Then today, I drove around a bit and the temp was normal, then stopped to shop. On starting up, it was not the smooth idle, but sounded and acted like it wanted to stall, which it did.
I restarted and made it home but had to keep the revs up above 1200 or it might have stalled again. I shifted to N to keep the revs up.
But, when I put it back in Drive, it began missing, was sluggish with little power. Parked in Neutral, the engine is slow to rev.

Any ideas?