I have a 03 silverado with a reoccuring code p0300.I have changed wires and plugs. The code will only set after 25-50 miles of extended highway driving at normal sppeds(65-70mph). You can drive this around town and short distance on the highway for months with no code being set.I have looked at history misfire counts and cyls 1, 5, 8 all show a high misfire count. Over the last year we have change to ethanol gasoline(no more mtbe).I have changed alot of injectors lately becuase of this new formulated gas.I just wanted a second opinion. Ac/delco injectores are about $80.00 ea.X=$640>00. Any ideas? Thanks. Jeff
have the same problem?
Wednesday, December 20th, 2006 AT 6:15 PM