So just picked my ski up again from shop. I bought the gtx a few months ago with lots of problems. Now down to one. It will idle on the water. I start it up and few second it cuts out. It also has a miss at 3000 rpm. Runs well at full throttle. New plugs, no error codes. The said the cleaned all the electrical. Connections all the voltage and computer readings are good. Thoughts? I live Colorado so altitude is higher.