1988 lb9, runs good when warm, but needs to be coaxed until warm or it dies. Used to idle rough and die. I cleaned the IAC valve, idles smooth now, it just dies when it's cold, and for some reason, it being in gear seems to help it not die (automatic). It has an aftermarket "blue Holley" fuel pump, or so I was told when I bought it. Any ideas as to what It could be? Injectors maybe? I really don't know, and am still early in learning about the mechanics of the cars. Any help would be appreciated. Thanks guys