Apologies if you've already seen this thread. I posted originally in the Disco II forum, but thought I'd post here as well to see if anyone has any other good advice.

My 04 Disco II (57000 miles) started jerking while I was driving the other day. This was the same day I got an oil change. Took back to shop and have misfire codes (P1300 - Secondary ignition fault; P0308 - cyl 8 misfire; P0305 - cyl 5 misfire; P0300 random misfire). Notice I have visible oil leaks out of both LH and RH valve cover gaskets. Oil appears to have dripped down on spark plugs and wires.

Shop wanted to charge over $1000 to replace gaskets. Have done some research and appears that it it possible to fix myself. I'm always up for a good challenge.

Anyone ever had this type of problem before? Do you think that just tightening up the bolts on the valve cover might solve the problems? Are the misfires (and the jerking feeling when driving) a result of oil on the plugs/wires? Or is there a bigger issue going on inside that I need to take everything apart to find?

Also, this started immediately after I refueled Could the misfires/jerking be caused by stale/bad fuel?