I have a 1996 855 non turbo with 200k. it has been running great and on thanksgiving going up a mountain in north carolina cel started flashing and was throwing codes po 300 303 304 and 305. it quit running and now wont start. I replaced the fuel pump relay. And can hear the fuel pump running when the key is turned on. It has bee throwing cod po 172 the last couple of weeks every 100 miles or so. I have replaced the dist cap and rotor. There is spark and checked fuel at rail valve and have good fuel pressure. Also replaced the camshaft sensor. there is also spark when removing coil wire from the dist cap,

When you turn the key-- engine turns over but acts like no spark or fuel.