So i have a Toyota corolla 86 sr5 4ac motor , basically car run great at first when it warms up(5-10 min) it starts bucking (surging bucking puttering)i ran threw all the gears and it only seems to do it after it warms up . As soon as i park the car it throws out all the antifreeze. The old radiator would not cycle the antifreeze so i replaced it and the thermostat same bucking problem. i think it could be the water pump so i am going to that next (the hole weeper is dry,not leaking). A buddy of mine told me to run the heater it seems to calm the car down but it does fix the issue , correct me if I'm wrong but it cant be the fuel system cause it would do it right off the bat or the transmission right ?? , hopefully its something stupid like a fuse but i wouldn't know how to start any help would greatly be appreciated. thanks guys

bump any help ??

It would help a lot if you can describe the symptoms in a little more detail.

Surging idle when it's warm usually means you have an intake leak or too much air entering the system.
For those issues consult this thread.
http://www.mr2.com/forums/mk-1-mr2-aw11 ... hread.html

If it's bucking while you are driving it that is almost always bad TPS adjustment. Test it and adjust it as per the BGB.