Dont know if anyone knows this before i scrap the fooker...

just put a new idle valve and mass air flow sensor on the car, yay i thought, the stupid low idle speed has gone, but now got a new problem...

idles fine for about 4-5 minutes, then goes into a methodic up down, up down, up down revving....on its own

wtf
my old idle valve was seized solid, and made the car car almost conking out, thats now gone, now the stupid up down idle revving thing.