Okay I just got a 1995 chevy blazer 4.3 2wd. It runs like a champ does not leak/burn anything. Oil pressure is always above 30 (even warm idle)

But when it is in drive at a stop it will be at a very low idle. It has not stalled out and it runs great at any other time.

I was thinking just adjust the idle but not 100% sure how to do it.

Another note, spark plugs look awesome, they are copper plugs and look almost new. Does not look like it's running lean (from looking at the plugs)