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need help i change the timming belt in my 99 dohc neon and after that it gime me the trouble code 11 ( timming belt skipped tooth ) so i went to another mechanic change the timming belt with a new one and peronally verified that the timming marks were ok but it gimes me the code anyway , then i hook the scanner a gime me the code P1390 ( manufacturer controlled ignition system or misfire ) ???? so is it the timing belt out of sync or are the sensors defective how do i know if are the sensor