I have the same mileage and symptoms that kicked a missfire code on 5 and 6. Code PO305,6. I also had a flashing Trac off and engine light. Both occured after I washed my engine. I had the Lex dealer read the code for $115 just to be sure. They quoted $850 for 2 caps, rotors and new wires. I ordered new caps and wires (powermax) from Rockauto. The change took two days but was worth the effort. I recommend you drill or using a soldering iron melt a small hole in the cap cover to access the lower cap screws. To do the job right, you would have to remove the belt and upper radiator hose. The good news is I found a knicked wire and lots of build up on the cap and rotors. Definitley a do it yourself job with basic metric tools. Following the change out, she ran normal on start-up. I drove to Autozone for a free code read and to clear the stored errors. All clear...All good. I also run Pri-G in the fuel. Wife finally let me out of dog house. 95LS400 :D
