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Check your timing, specifically the mechanical advance. The EZ-EFI does not control timing and with some of the light advance springs installed in performance engines, the weights are on the verge of opening at idle. The EZ computer sets the idle speed in neutral but the advance weights have advanced the timing a bit so the idle speed is up. As soon as you drop it in gear the motor lugs down a bit, the weights drop in and timing retards and the idle drops to a point where it stalls. This happens with carbs as well but with the EZ-EFI it is very touchy. Get the distributor recurved so that there is no advance before around 200-300 RPM above your idle speed in neutral.


Using one of the lightweight springs and the lightest of the stock springs has worked well for me to fix this problem.