Your car doesn't have a choke. The first step should be to have the computer scanned for any stored trouble codes and post the numbers here.

no one can find the trouble with computer.

Your system tracks misfires so if it is actually misfiring, the computer should have a code stored identifying the cylinder number.

i have been to three workshops with this problem & they can not find the cause ?

can i corect the prblem myself ?

You have to find it before you can correct it and that is going to require a knowledgeable tech with some professional equipment. That doesn't sound like what you have been dealing with.

thakyou,was worth a try.

i have a working knowlege of how engines work.

i have tried to download the repair book,no responce.i did ask if it was posible for a free download as i am a pentioner & dont get much pention ?