1999 Mitsubishi Mirage

Engine Performance problem
1999 Mitsubishi Mirage 4 cyl Front Wheel Drive Automatic 114.00 miles

I want to know, if I have a big crack in the exhaust header it will decrease the starting acceleration of my engine? By the way the real problem is my car star slow and cant go up in hills easy it take time about 10 or 15 sec but went I start the air happens the same I have to pull the acceleration pedal full for get acceleration
June 7, 2009.

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