Hi all, I have a 1992 mariner 50hp 2stroke 3 cylinder and I bought the engine knowing it hadn't been run in a while. I've got it running but its not running right. I've put some spark tester light things on the plugs to check they where all firing. Cylinder 1 and 3 seems to have a weak spark when revved up. Number 2 cylinder fires a continuos big spark yet the other 2 seem to die off when revved. If anyone has any advice or input on what to test or check before I spent money on it. thank you