Re: P0300 code
P300 can be a bit of a nightmare.
It can be anything from a burnt valve causing the problem (lack of cylinder compression), to a bad head gasket.
If you're lucky, it's just a vacuum leak to the intake manifold. A bad intake gasket can also be at fault.
'00 Durango R/T 360ci 290hp (modded); 138,500m
'06 Pontiac G6 GT 3.5L 220hp; 44,000m
'12 Chrysler 200 Limited 3.6L 283hp; 13,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!