I have a 92 RS 305TBI/auto car. In gear it idles at around 450-500 rpms and lopes like it has a big cam in it. When I put it in neutral or park it gets a little better but still lopes a little. Once you give it the go juice it runs fine and doesn't miss or skip a beat. I out another TB on it with the Ultimate TBI mods and adjusted the fuel pressure but it did the same thing. It has a fairly new EGR, Air idle valve, plugs, wires, dist, rotor on it. Any ideas????

 

Anyone with any ideas?