98 ram 5.2 help needed

Ive bought a truck that I have another thread on. I was wondering if there are any members that have done work on a 5.2 from 1998 or similar. I did the plugs, wires, rotor, cap, dist pickup this morning and I still have a miss at idle thats very noticeable in gear. Once its off idle and above 2000-2500 RPM's it smooths out or at least seems to. I can rev the engine from 1500 and up and not feel the miss.
Now the truck has no brakes or tags or inspection so I cant drive it out on the road!
I did a compression test today before I changed the ignition parts.
Drivers side frt to back: 140, 150, 150, 150
Passengers side frt to back: 145, 150, 140, 150
I have not done a leak down test yet but will this week.
I guess I should also check the injectors. I do have a noid set. Do I just unplug one at a time while running to check them or do I check them not running?
The motor sounds good and does not have any tapping or motor noise.
I bought an plenum gasket set and have done some reading about the issues surrounding them, but havent gotten to replace it yet. I dont want to replace that gasket and still find a miss so Im thinking when or if I need to replace it I will I would do a valve job at that time.
This is going to be my towing truck so I need to fix it right, no corner cutting!
Yep I need your help with direction on this as Ive never done more than a tuneup on these engines.
Thanks Rod