Australian Car Repair Issues? Ask an Auto Mechanic for Answers ASAP
What make and model of vehicle do you have?
What engine and transmission?
Do you still need help with your car?
Difficult to say what your problem is.
How old is the fuel filter?
How old are the spark plugs?
Is the jolting instantaneous as you hit some boost, or takes a second or so?
A bit concerned with your statement of "fumes", how many kms has this engine done?
Have you had any success with your misfire problem?
I did have one a few years ago where the ECM was knocked by the drivers feet, with a plug partly disconnected.