Remove it all and toss it on the ground.
Use a real ridge vent made for shingles, not a metal roof.
I told my friend to pick the urethane tube up and he bought the cheapest but i hope it works for a while
I finally figured it out, lol my friend help me with the starter row on the shingles and i did not use any sealants for the tar paperDoes the porch roof transition into the house roof?
Is the porch heated?
If yes to either it may be better to run ice and water over the entire roof.
Can you post a pic or give us some more info
what is the pitch?