JoAnne, you didnt answer my question about who built the engine. Was this something you guys did yourself, or did a shop or a friend do it for you? I wish I could understand the part about 'dieseling' sound...I know what that should sound like, but I cant relate it to a chevy engine. Do you mean a rattling sound? Knocking? Pinging? This is the part that concerns me. And how are you positive you dont have a vacuum leak? I still think it might be the problem, at least with the stalling part.