P0300 Dodge - 2007 Dodge 4.7 intermittent engine bucking

Question

I have a 2007 Dakota quad cab 4.7 E85 .But I run regular gas. I get intermittent bucking both mild or severe for a few seconds then drives ok. Pulled plugs and replaced, they were ok. New crank position sensor still gets the intermittent problem. Dodge wants to redo the heads but that doesnt make sense as the problem occurs off and on engine cold or warm. Occurs with trans out of OD,, so I dont think it is a lock up issue. Any ideas? This doesnt act like lack of fire to a few cylinders but misfiring or cross firing as it just is more than lack of power or hesitation but bucking. Thanks Chris

Answer 1

P0300 Random misfire

Unless the misfire is identified, this can be a igntion coil, just one igntion coil that misfire is capable of setting a random misfire event, The use of a vacuum gauge will help in determining whether the cylinder head is at fault.

 Here a vacuum gauge used for a Dodge Ram , at idle the engine had a misfire condition, P0300 and a P0172 (Fuel trim rich ) , This would need a cylinder head. where the engine vacuum should be 18 to 20 vacuum.