New engine will not idle smoothly, and now won\'t stay running. I just put a new 350 into my 85 Jimmy. It ran pretty good, a little rough when I first started it up, but now I can't get it to even stay running. Last night I tried to start it and it would start, but the RPM's would just slowly drop until it died. We tried setting the timing today and it ran even worse where it is suposed to be set. Tried dicking with the fuel/air mixture screws but that didnt help. I got a stock Quadrajet, could it be screwed up? Or is my new engine hosed? I could also use the names of some good tune-up shops in the south-west Denver metro area in case I reach my wits end and give up.