Hello,
I have a 1985 GSL-SE rx7 with the 13b from factory. My idle use to surge reel bad from 1000 to 2000. So I took the throttle body apart and cleaned it out and then I replaced the TPS because the old one was bad. Then it still surged so I unplugged the two valves that controlled the bac valve and ran great but still surged but not as bad. So I took the bac valve off and I mad a block off plate with a gasket and now it only surges about once a day. What else could make it do this?

Thanks