i have land rover freelander model 2000 engine 1.8 petrol.the problem is this that my landrover missing or knocking at slow gear and also their drive hard.for that i check their ejectors one by one all four ejectors give equal flow of fuel.then i check the fuel pump they also give good pressure.now please advise me that what i should do for stop this knocking or missing at low gear and for smooth and light drive.