88 Daytona Pacifica just changed motor got it running had gas in oil rich code came up changed oil and code now gone(it did not seem to run irradic before we changed the oil mixed with gas if that matters)..Showing no codes now but now when we start it runs fine for about 5 seconds then the idle gets irradic-goes up & down and then stalls. Started it and tied to move it as soon as we put it in gear it dies.. it's an automatic car..All vacuum lines seem fine, while car is running it has about 14 to 16 on the turbo/vacuum gauge..We did move the idle star screw abit on the throttle body..Motor was running fine in another car before we changed it and was recently rebuilt/has great compression ..If anyone could help with any fix it ideas that would be great!! we are again going crazy!!! Thanks!!