[trophy956]

hi it sounds like your getting miss fires from the engine ,either from a coil or injector ,injectors do have codes for electrical failure but not from mechanical failure ,with cars with out codes i get a second person with the the car in gear try to load the engine and get it to happen then you can disconnect injectors to try and locate the cylinder or more than one that is giving you the trouble ,swap the coil to another cylinder to see if its the coil or injector
charlie