my 2001 petrol frontera judders when accelerating,i have changed the plugs and the fuel filter and added injection cleaner to the fuel tank but this has had no effect and its still the same ,could anybody help with a sollution ,thanks

danny mckee, October 2011

You are assuming that it is engine related. I would start with the simplest, air filter, take it out, if then ok replace it, if same put air filter back in. next, I assume mechanical judder, are your brakes locking on? jack up one wheel at a time, are they free. dont forget to block the wheels when you take handbrake off, and make sure in nuetral. also when up check back forth movement of wheels, can you move them. should not be able to. same with in out.

SD, October 2011