Hey guys, im new to the EFI 5.0s and im having some issues that I cant seem to fix on my 1989 Mustang GT. The car was off the road for about 22 years an I was told it had a 1990 GT motor in it with an 84 AOD trans. Car will start up fine but it sits around 1500RPM in either park or netural and when you give it throttle it struggles an then sometimes will surge down slightly repetitively. However once its put into gear. If it decides it want to go into a gear which is another problwm im...

HIGH IDLE IN PARK/ NETURAL