Kangaroo jumping at low speed - 2001 Ford Focus

More the prefilter..it gets ruined by lowsulfur diesel. U gutta drop tank n remove sending unit..its on there. May also b worn injectionpump

Sounds like a fault on the throttle body any warning lights showing on dash board?

I would start with a complete tune-up then if its running rich(black smoke) need to fix the problem like new air filter(s) and such do a compression test of each cylinder (one at a time) and see if readings all come close..may have burnt valves or blown head gasket also look at vacuum systems and see if any hoses are off missing or broken repost on this please thanks...

if you had the vehicle fully serviced, i would check the tire pressure on the tires on your vehicle.

If the injectors are weak it will do this. If there is not enough fuel delivery from the fuel injectors the car will do what is called a lean pop. kind of like a back-fire in the intake.

check hoses for splits...i had the same problem.

When you hop into the car you may need to jump on the revs a bit more to be able to bound off the line smoothly.Was the car built in a leap year?.Nah.Seriously.If the motor is out of tune the engine will behave like you said.Get that checked and also ask the shop to check the clutch is operating smoothly and not shuddering.Take-off revs is around 1100-1200 revs min. Hope this helps

i would say your valves or valve guides are going out and need replaced, or your vacuum advance needs changed

replace IAC (idle air control valve) and replace coilpack,wires,plugs that should solve your jumping and reving.-z i have one i replced all above and have no problems scince

Welcome to FIXa

Sounds like the drivetrain is slipping best bet might be to take it to a garage sorry but thats what it sounds like

have a good day :)