Chevy silverado p0304: cylinder 4 → misfire detected Silverado chevy p0446 p0455 system evaporative emission code control vent circuit leak mount motor bad evap detected large malfunction diagnosis
Chevy silverado p0446 obdii code diagnosis Silverado chevy code p0442 p0171 p0121 p0304 misfire trouble common relatively cylinder detected stands 2002 p0332 sierra sensor knock silverado edition 2008 help ryan cab