i got a 89hf with a b16a in it. when i start my car it has a slight miss. once it warms up the miss gets worse. i put new plugs and wires in it but still the same. i was going to do a cap and roter but i dont even know what kinda car i could get a cap and roter out of. another thing after leting my car warm up the idle gos up and down, ranging from 400rpm to 1500rpm. a friend of mine told me its probley the IAC valve so i took it off and cleaned all the junk out of it but it still dose it. iam not throwing any codes. please help