hesitate

Hello everyone! (tl;dr at bottom) History: I purchased my GTX in a pair which I went in on with a friend, a 96 and 97 GTX. I was told the 96 had a new engine (mid 2012) so I thought it would have less issues, but I was so wrong. After purchasing it need a new battery because the one it had...

i have a 1994 seadoo spx and it start, idles good, but once i give it gas it seems to hesitate, when it doesnt hesitate it just revs up. i think its possibly a broken sheer pin? any ideas