I am sorry that you have not been helped yet. I just came online and saw your question
Ok, first you need to check for any vacuum leak, air intake tube leak, or leak around intake manifold
idling, spray around intake manifold, throttle body, each vacuum hose and air intake tube with carb cleaner. If idle smooths out when one is sprayed, the replace it.
If ok, check for dirty throttle body and clean if needed.
If ok, then fuel pressure will need to be checked, fuel filter checked, water in fuel checked, and finally engine compression
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