I've already checked all the other things spark plugs for coil packs all that stuff I did a compression test and my number 3 cylinder had 70 pounds and the other 4 had around 150 I did a wet test and compression only went up like 5 pounsp what's that mean

 

Do a leak down test. That will let you know if your problem is either an intake or exhaust valve, or worse. Did the engine have any overheat problems?

 

I don't know we just bought it for my step son and after about a 100 miles the code popped up I've never done a leak down test can u maybe give me info on that I just ordered a leak down tester online but how do I preform it

 

Set the cylinder you are testing to TDC on the compression stroke. Screw the tester in the spark plug hole. Add about 100 psi of air and listen. Tail pipe= leaking exhaust valve, crankcase= rings or piston, coolant tank bubbles= head gasket/ head/ block. That is the basics.
You can check YouTube, that's how my kids learn everything.

 

Thanks for ur help I really appreciate it alot