Nissan Repair: Misfire, optical pickup, air meter

Question
1983 280zx turbo, Has a misfire at idle. Ran fine untill shop replaced three inject. They sent them back and orderd three more. Same problem. Then they changed the plugs, cap, fuel filter, and cleaned the inject. wire harnes connection. Whey found corroslon, but did not replace. This all started with number 1 lnjecter leaking but car ran ok. Car did sit for about 5-6 years. Can you help! lost...Thanks ever so much...  

Answer
Kornell,

Check the intake hose from the air meter to the throttle body and see if you have small cracks.  These can cause the misfire as can the distributor being defective.  The shop or you can check the switching of the distributor with a meter or you can take the inner cover off and look for the presence of oil on the optical pickup.