I'm having a problem finding an answer to my problem. Looking at the front of the car, on the left fender wall, there are 2 relays, or what I think are relays. When I turn the ignition on, one of them continues to click and it sounds like my fuel pump is running. Then I go to start it, and it sounds like it's running on four cylinders. What is this part? what does it do? the numbers are worn off of mine and I can't seem to find this part. Please Help.
Thank You

 

Check the engine bay map you'll find at https://mustangforums.com/m_563238/tm.htm to help id the relay.

 

i think its called the ccrm(constant contol relay module) i had to check mine out before. is it right in back of the radiator? if it is it sends power to the fuel pump and somethin else but i forget.....read up on it a lil but im pretty sure thats what its called