what can be the cause of my ford escape 2.3l engine no start due to no spark con

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a local technician check it 2 years ago, he requested to change the Ignition Coil, i bought a new Coil twice, it didnt correct the problem. he requested a Cam and Crank sensor and TPS, i bought right away but again it didnt correct the problem still no spark is going out. after that he requested a new ECM soo i bought a new ECM but when the new ECM is installed still there's no spark going out. now my car is two years stock on garage. please help me, what coud be the causes of this no spark problem? What seems to make the problem better or worse? its worse How long have you had this problem? 2 years