range problem
 

Two left burners ignite but two right ones don't. Using the matches I can ignite all of them .When I start one of the left burners I can see sparks on all of the burners . What is the problem , which parts need to be replaced and how to do the replacement

Sounds like either you have dirty or disconnected ignitors on the right side; or a faulty spark module. Here's the part number for the module. Part number: AP4010034

. Try cleaning the ignitors and diffusers before committing to the purchase of the module.