can anyone help me? PLEASE!

i have a 89 mazda b2200 with a completly stock 2.2 engine that is carbed. the problom im having is that once it warms up and it idles where it suppose to it cycles so to say. it will idle for like 10 sec at like 700 rpms and then it will jump to like 1200 rpms for 10 sec. i cant figure it out. other then that it runs ok. if u need anymre info let me know. any help is greatly appreciated. thanx

vacuum leak/problems

do away with all the bull and weber it!!

weber would be awsome but i live in cali and dont think it would pass the stupid smog laws here. ive looked around and so far cant find a vacuum leak, ill keep looking tho.

is your carb clean?

there should be adjustment screws on the carb,fuck with them till it stops i did