Click sound

Well it started 2 days ago I was on the
highway and my truck was having a hard
time going over 40 and started getting
halfway hot so I took it to the shop by my
house and the test said my map sensor so
he took it off and sprayed it. This morning
on my way to work it was fine but this
afternoon when I got off work I turned my
ac on for a few minutes then turned it off
when i got on the highway and it all started
again and when I got home and shut it off I
went and turned the key to roll up my
windows and herd a click sound so I
turned the key back then back the other
way again to listen and it did it again?
Whats wrong with my baby:(