Found old service report in the rig I'm looking to buy. The 2001 disco 2 runs rough starts rough and has no power. The owner had a ton of work done but I keep questioning the plugs and wires ( replace in April of this year ). She took it to a Toyota dealer and the report says they found codes po303, po304, po306, po307. Misfiring. Did they put the right plugs and wires on. The spark plugs are DENSO P16R and the wires are blue STI with a marking on the cap of KW410. I pulled one plug and was fouled and checked the gap at .045. Did they do it right?