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Efi
Have you checked the TPS ( throttle position sensor)? Max voltage should be .997 vdc. What is rpms at idle? Vaccum leaks will also cause the problem you described. I had a 5/16" hose on a 1/4" barb and it took months to find the leak. A couple of good books to buy;
How to Tune and Modify Ford Fuel Injection by Ben Watson isbn 978-0-7603-0503-4 retail $19.95
The Office Ford Mustang 5.0 Tech Ref & Performance Handbook by Al Kirschenbaum isbn 0-8376-0210-6 retail $34.95
Dwight
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''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
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