Where did you move FROM?

A car needs three things to start and run:
1) Air
2) Fuel
3) Spark.

All of these things must be present in sufficient quantity and strength,
and happen in a sufficiently timely manner in order to make the car go.

The exact description of the starting problem is critical to diagnosis, as
I've said before. Choose one or more of these:
1) Turn key to "start" and...[crickets].
2) Turn key to "start" and the engine just clicks at you.
3) Turn key to "start" and you hear a loud high-pitched whine (typical
older Chrysler problem).
4) Turn key to "start" and you hear and feel the engine go chugga-chugga-
chugga, but there's no sign that it wants to catch.
5) Turn key to "start" and you hear chugga-chugga=chugga-cough-sputter-
chugga-chugga-sputter-sputter, but it never fires up.
6) Turn key to "start" and it fires, but runs erratically and finally
stalls. Black or heavy white smoke may come out of tailpipe.
7) Turn key to "start", and it cranks, fires, but stalls as soon as you
release the key.

Each of the above is a clue as to what is wrong.

Since the relay is down, next time it won't start tap on the relay while
turning the key, if it starts then I suspect your mechanic swapped the same
relay in and out.

My car does not run well on uphill driving. Sometimes it climbs fine.
Sometimes
it doesn't. I think it's has to do with humidity of atmosphere. The air
going into
engine is not constant.  Some sea level it's ok and other sea level the
air is not going
well so the engine hesitate. I don't know what to do about.