Check the vacuum line connections. There is a wiring diagram in the manual (link on this site) to make sure those routed correctly. I had an idle issue at one time because of a missed vacuum connection.
Can you keep it running with throttle input? If so get it warmed up and see if the idle comes back to you. If so you have an issue somewhere within the cold start circuit.
I had the same issue with horrible idle and throttle response that turned out to be a leak in the intake plenum gaskets (lower plenum to block).
You can also try spraying some carb cleaner around the injectors and intakes to see if that smooths the idle. If so you got a leak.
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