Thanks for the feed back. To keep this from being 3rd. hand I have copied her thread below with all the specifics. If anyone has any ideas, I will be talking to her tomorrow and would be glad to pass on any and all suggestions.
"Dear Land Rover Gurus,
This is my saga: 1 month ago my Disco II with 127,000 KM died. The Harmonic pulley had failed. Codes: P1590,PO300, P0303, P0134, P0135, P0155, P0304, P0308, P0150. After new pully installed all codes erased. Drove it 1 mile and returned to the shop.
Now error codes: P1590, P0135,P1300,P0301,303,305,307. They erased all codes, let it idle for 20 mins, the codes that returned are: P1590, P0307 P0135. Mechanic checked spark plugs (which were only 6 months old and at that time changed the wires too 8mm and O2 sensors front and back on the left side. There were 4 spark plugs that were bad, replaced those. They replaced 02 sensor the one that corresponds to P0135. Still P1590 (I know this is the 3 amigos and it doesn't worry me), however P0307 misfire still detected. Mechanic thinks maybe the wire for the 7th spark plug is faulty and suggests I change that one as well as put Ignition cleaning fluid in the gas
I go to pick up a wire for the 7th spark plug, the truck is really running rough now. They check the codes again. Now, all four O2 sensors 0150,0155, 0134 0135 and cylinders 1-7 showing misfire along with the 3 amigos P1590 and P1300.
Mechanic is stumped. He now thinks since the misfires of 1,3,5,7 are occurring that maybe it is the ignition/spark/induction coil on that side. Where I live there are no Land Rover mechanics, and my mechanic suggests I post on a forum where guys will know more than he. I don't know if he checked the fuse boxes to see if there are any faulty fuses and or corrosion. I live in the Dominican Republic.
I apologize for any words that are incorrect since I have a translation challenge where my mechanic is Russian and speaks no Spanish or English. He did work on Land Rovers a bit in Russia. The dealership in Santo Domingo is horrible. They couldn't even change the oil correctly and tried to stuff 9 litres of oil and didn't tighten things it was a horror show."