Kia sportage 97 Loosing power CYLINDER 3 NOT WOHELP NEEDED DESPERATELY

ENGINE LOOSING POWER SPECIALLY GOING UP HILL AND OVERHAUL HAS BEEN DONE SCANNER SHOWS FOLLOWING CODES p0107 ,po303,p013

Hey scotty . I have a question I have Kia Sportage 1997 overhaul has been done. I have changed fuel injectors, coils and cables spark plugs gas filter, gas pump and it started working fine but all of the sudden the car started loosing its power specially going up hill we even call an auto electrician whcih didnt find anything wrong he said it could be an injection issue or ECM .Our mechanic has ran scanner and the scanner has showed 3 codes p0107 ,po303,p0134 one is cylinder 3 which is not working and fuel injector has been replaced coil and cables have been change but upon checking the spark plug we notice that the spark plug was wet from gasoline what can be causing this any help will be deeply appreacited I dont know if changin these oxygen sensor will help we have spent so much money had to pawn things to the car working an no luck

do a wet and dry compression test of the engine first, if engine is not just flat worn out on some of the cylinders, i would suspect bad wiring or bad ecm which those are known for

Thank you scotty.. Thank you for answering

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