Hi Guys,

I have a BF 4 legacy wagon running a swap EJ15. I recently did service (engine oil, air filter & plugs change) and gassed up the ride. I notice that the smoothness in the drive has changed. on low raves the car runs smoothly but when pressing on the gas in order to gain momentum, the cars starts jerking a if its running low on fuel. What diagnostic areas should i look at?

Thanks Jeremy

Edited January 12, 201511 yr by kibonzo

I'd suggest looking for a vacuum leak.   Did you plug the wires back into the plugs properly?

fuel filter and pump imo.

My thinking also lies on the fuel system i.e fuel pump and filter.  The plugs were well fitted back.