Hi!

I've reviewed numerous threads on here re: the P0300 issue, but to no avail. Here's some background:

Vehicle:
  • 2005 Chev Aveo
  • Manual Transmission
  • 182,000 km


Symptoms:
  • Idles fine when engine is cold or hot
  • No noticeable missing when engine is revved and no load
  • Noticeable missing when cold and under load
  • Missing less noticeable as engine warms up
  • After clearing code, CEL will illuminate and flash between 40 - 60 km/hr with engine between 2,500 and 3,500 RPM and stay flashing until code is cleared


In the last 1,000 km:
  • New Alternator
  • New Wires
  • New Plugs
  • New Coil
  • New EGR Valve
  • New Serp Belt
  • New Thermostat
  • New Timing Belt/Idler pulleys/water pump/Inner timing belt cover
  • Replaced head with all new valves and seals
  • New Battery


Troubleshoooting performed:

  • Compression Test (#1 190, #2 175, #3 160, #4 180)
  • Carb Cleaner Sprayed around vacuum lines and intake (1 Leak found and fixed)
  • Misted new wires/coil (no issues)
  • Vacuum Lines checked and compared against schematic (no issues)


Anyone have any suggestions for further troubleshooting or potential solutions before I give up and bring it to the *gasp* dealer??

Any help is appreciated.....