96 disco se7 misfire spit fart

ok well here goes....I am new here and new to this so go easy first of all I dog legged the vehicle home a rough fifteen minutes or so running really bad...the body 117k the engine 29k on a rebuild. so I felt like I got a really good deal if it was perfect I would have had to pay a couple thousand more...anyway....since I have gotten it home I have replaced the plugs and the wires....the oil...drivers side window regulator....the previous owner changed the iac.

I took the ecm out because the wiper fluid had corroded the box so bad it looked like snot inside. I cleaned it out really well with contact cleaner put the box back together...and now I can get the scanner to uplink when I could not before....whew! all this in a couple of weeks.
it runs better but it is still missing and it will die at a stop light. the idle is very low and erratic. The plugs I changed were black soot covered and I believe it was two and four had gas on the plugs.
I bought a couple of coil packs for a really good price today and I haven't had the time to put them on...but I really have a suspicion that the packs aren't the problem. the scanner doesn't spit out codes but here is what I did get out of it.
at an idle
FTRM 25.0
FTRM1 12.4
STFIRM2 25.0
TPS 12.4
RMM 1754
EMC ADV 43.5
IAT 18
MAF .130

I am not a mechanic and I am really new to this but I am trying really hard and I am addicted to this vehicle and I am not sure why I have only driven her a few times. Please any advice will be appreciated

in english please what age is 3.9 dont have coil packs 4l didnt come out till a couple years later

op2:

it is a 1996 discovery with a 4.0 v8 with gems fuel injection is that what you mean? sorry if I wasn't speaking english I can be excitable.

You may not get a great deal of help from this forum as its mostly UK based - your truck is running GEMS wheras UK versions had 14CUX EFI with a distributor rather than coil packs.
From your description it sounds like it needs plugs and leads as a minimum.Your readings are a bit difficult to dechipher,but it looks like the fuel trims are going all the way positive.This suggests inactive oxygen sensors,so these need checking out too.
Get it sorted and it will be a good system and should then be reliable.

thank you....I took the ecm out of her the other day and upon closer visual inspection I could see that there was a spot of three leads in the ribbon cable where it had shorted out. So I purchased a new ecm on ebay and will get it in either this week end or the beginning of next week. I didn't think about uk rovers not being on the gems thank you. for your help though I do appreciate it. I am sure there are problems that we may encounter that are similar though and I will stick around.