I have a coolent leaking somewhere around the waterpump and when its warm it will stop. My dad thinks there could be a screw that needs to be tightend.

The engine light it on and the diagnostics say MASS AIR FLOW but I replaced that and 4 days later with lots of driving the light is still on. Someone said I have a exhaust leak, could that be the problem bringing up false diagnostics?

 

problem 1

look at your water pump seal. it is probably just starting to go bad if it warms up and stops. There is a "weep hole" on the bottom THAT IS SUPPOSED TO LEAK exactly as you describe to tell you that it is time for a change BEFORE the car leaves you stranded. Unfortunately it seldom works properly. You must be the lucky guy...

Problem 2

Are you running a K&N filter? Sometimes the oil from the filter puts a slight film on the MAF that throws a code and then goes away after a time...

 

problem 1
Should I get that done right a way? How would I fix it

Problem two
I only have some stock air filters, I havn't yet bought the air filter I want