at around 3000rpm my car will jurk forwArd and back violentl

at around 3000rpm my car will jurk forward and back violently when
going at a constant speed (3rd gear 50km/hr) the only way to stop it
is to put the cluth in or speed up.
please help.

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"90celicast" <none RemoveThis @000.com> wrote in message
news:998844_e7d0e3244c8c4b338ffedf242115b22c@autoboardz.com...
> at around 3000rpm my car will jurk forward and back violently when
> going at a constant speed (3rd gear 50km/hr) the only way to stop it
> is to put the cluth in or speed up.
> please help.
>

What model vehicle? What is the odometer reading? How long and how many km
since the last service?

Things that can cause the problem you are describing are a problem with the
EGR valve, improper ignition timing, a problem with the ignition system
(coil, distributor, rotor, distributor cap, high tension wires, spark
plugs), a vacuum leak, or a problem with the throttle cable.
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Ray O
(correct punctuation to reply)