Ballast Bypass

I Know Someone Here Knows This Answer. I Have Worked On Two Chryslers In The Past Two Weeks. They Have Both Had The Same Problem. They Both Had Stock Ignition Systems Dist., Coil, Ballast. The Problem Is They Would Start And Run, But Missed Or Had Very Weak Spark. If I Bypass The Ballast With A Jumper Wire They Would Start And Run Great. I Know This Is A Problem And Can Overheat The Coil. But I Cant Get Proper Spark Going Through The Ballast. Could The Ballast Be Going Bad To Much Resistance. Maybe A Bad Ecu. Ive Seen Other Cars In The Past With A Jumper Between The Ballast, So I Know Im Not The Only That Has Had This Problem. I Would Just Like To Run The System The Way It Was Intended From The Factory. Any Help Would Be Very Appreciated.