1994 Hyundai Coupe Car Starts Back Fire After 110km H U Only Drive 60km H

1994 HYUNDAI GENESIS COUPE
224,341 MILES
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The car starts to back fire after 110km/h and then u can only drive it at 60km/h. I have changed the fuel pump, plug wires, plugs, coil, and checked the cam belt the problem is still there help thanks
Jan 4, 2013 at 9:30 AM
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