I just bought a 1997 GTX. Personal watercraft is all new to me When i tried it out for the first few time it ran like a bat out of hell. I took it out this weekend and it ran good up to about 35 MPH and when i go at full throttle it seem to rev up and down like the carb injectors or dirty or not getting enough fuel. Should i put some fuel injector cleaner in the fuel tank or just take in to the shop?