I have an 03 GT and recently its been getting terrible milegae. It has 96000 miles. Its also summer time where i live and usually i get better mileage in the summer, i hardly ever use the AC unless its raining. The only thing i can think of is my spark plug wires and my I/H/E. My wires are stock wires, im going to change them my next paycheck i just never did them yet cause the car runs fine, no misfires or anything. I put headers on about 3 months ago. I never did the tune with the headers cause i didnt want to spend that much money just for 5hp. Any help would be great, ive tried injector cleaner and fuel treatment. I checked for gas leaks and i dont smell any gas. So whats going on?????? One more thing, i dont beat on the car or romp on the gas. I always shift around 3000rpm and about once a month ill really step on thr gas. Otheer than that i trive fine
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