1985 rx7 miss firing or vacuum leak?
 

feels like misfire but is it vacuum leak,wont idle under 1100 and rpm's lope?

So check for vacuum leaks. The vac diagrams are in the FSM. Spray some water around the area you suspect is leaking and listen for the engine to change tone as it sucks in the water.

i did,but i used starting fluid sprayed around all vacuum lines every were and no change in idle to find leak.it should rev when it sucks in starting fluid.