I have owned my 2000 Discovery II for 5 years, 123,000 miles. Several months back I swapped out the plugs and wires due to misfiring. All has been well, until this week. I changed my oil and filter Sunday evening. Today my wife noticed the truck riding rough during acceleration. The engine sounds fine in park even when I rev the rpm's. It feels like a misfire, but my experience and gut tell me it is something else. Could it be the transmission? I used synthetic oil this time, if that helps.

 

Has the front driveshaft ever been replaced? This might seem like a chaos theory speculation, but the driveshaft may be on its way out. The original driveshaft does not have any grease fittings and are known to explode as they age.

Cheers,

Pete

 

Sounds like you need another tune up, make sure that you only use Magnecor or LR plug wires.

 

Is your check engine light on, what brand of plugs and wires did you install?
Better describe this roughness.
Yes, it could also be a front dive shaft, have you ever had the 2 greaseless u-joints replaced?

 

My check engine light is not on. I used the auto zone cheapo cables, but good plugs. It just feels different than the plugs and wires. I can't explain it but different.

I have never had the greaseless u-joints replaced. Are the u joints part of the drive shaft? Where can I find a picture of diagram of the u-joints?

 

Never mind. I found Tom Woods' site.

 

any chance the wifey put 87 octane gas in the rig?

 

Chances are those cheapo spark plugs and wires are causing the issue. Make sure you use the Magnecores or LR Plug wires like Spike suggested.

 

Yeah, I am leaning on the plugs and wires, since the rough ride comes with some loss of power. Would loss of power be a symptom of driveshaft issues?

 

on any other vehicle i would say no, but its a LR. these things are a "special" kind of breed.