burp, hiccup, miss, whatever you wanna call it, i got it.
 

Hi All,

99 Disco II, 131k miles, owned it since 126500, sept 2014. Previous owner had the water pump, timing chain, and associated parts replaced in 2012. I had the same parts replaced in January. thats what I know about previous service.

I have replaced:
A Pillar trim
Head gasket job
timing chain, water pump.
installed ultra gauge
and last week coil and power steering pump.

So the issue i am having now, Last week ultra guage said i had a miss on cylinder 5. Took it to goodyear, where i have had my prevous cars serviced successfly. They said it was the coil, replaced. I have driven it 80 miles and it has started to miss but no code. It is only at idle, and Iam not sure if it is a miss or what. It only started today for a total of 10 miles in Dallas suburban driving. now about a month ago I had a pending code for my oxygen sensors. but it never went full blown code. I have the ultra guage set up to read the oxygen sensors, but i dont know what i am looking for as far as the numbers fluxuating.

so that is my current status and it drives fine and has power. I will be taking it back to good year for the annual inspection on saturday.
Any thoughts on what it could be causing the stumble, jolt....etc?

Plugs, wires, fuel injector...pick one. Post a pic of the O2 readings at idle

ultra gauge pic
 

https://www.dropbox.com/s/fl5yu7uxyr...94417.jpg?dl=0
the left side fluctuates. The right side does not really move at all. this picture was at start up. thanks.

Well, that's because the right side is for the rear. The left is for the front.

yeah i was watching it for my 30 miles of driving today and figured that out. silly me. as long as the numbers (volt readings?)are jumping it is good right? what should i look into next?

Like I said before. Culprits could be spark plugs, wires, fuel injector. Switch the plug to the opposite side and see if you misfire moves.

Does the new missfire register on the same bank serviced by the "new" coil pack? What I'm getting at is, could the misfire be in the other bank? It's considered best practices to replace cool packs in pairs. Let us know what side the misfire is on.

I would also begin planning to swap out your plugs and wires.

I took it back to Goodyear and it passed the state emissions inspection. They could not feel the slight bump i was talking about. At this point I think it is something not fully connected from when they did the coil. Plugs are new from the head job, and they said they checked those. I think on Friday I will climb under the hood and check connectins. If it is still causing an issue I will run it to the land Rover guy and let him sort it out.

update
 

Did not find anything out of the ordinary and will dive in again. Got a code on the way to work this morning. P455. Google and I tightened the gas cap, cleared the check engine light. Went to what a burger and no code. Granted I went two miles, but got upto operating temp. So I have a code and will go from there.