If the CEL comes back on due to misfires in 5 then you know the problem isn't the plug.

 

I would start by doing just the plugs. If the wires and packs aren't causing the issue then just wait. That being said I keep a set of spare wires and at least one coil around in my spare parts bin so I don't have to wait on parts if something comes up.

 

Thanks

Gonna get around to doing that!

 

The only time I've gotten a misfire code on my disco happened while I was running a tank of regular gas from a gas station out in the desert, I was out of premium that I brought along.... I was on my way home from a camp trip. That was probably 25-30k miles ago? I'm still running the same sparkalaters and wires today. I always run premium gas though....probably because of my misfire experience! idk....

 

I've ran D2's on gas that sat in them for 2-3 years and I didn't get a misfire lol. Gotta love 500.00 wonders with a full tank of 3 year old fuel lol and a bad CPS. If it was a personal vehicle I'd have drained it but a parts truck = let it run lol

 

Ok that's it. No more premium gas.

 

Regular is OK as long as you don't mind less mpg and retarded timing on an already underpowered vehicle

 

Even before I did the O2 sensors and the exhaust smelled like rotten eggs I had put premium in it and once you switch to regular it's a noticeable decrease...

never again. it slouches to get up to like 40mph

 

i run Premium 93 Octane in all my Rovers.

Ethanol Free if i can get it. my trucks love Ethanol Free 93 Octane fuel. noticeable power difference and better MPG.

 

Dude, something's seriously wrong. Not even a Disco should be that slow. I cruise at 75mph on the NJ Turnpike.