i have a chrysler motor not sure what model i beleive in the upper 70's because its on a 79 fishing boat and was told it came on the boat.. it has ran fine for 2 months.. it has the pull out neutal warm up on the throtal box and i pulled it out to startit and when i pushed it back in to take off it just revs up now... forwards and backwards its like its stuck in neutral... im new at this so i have no idea and no manual... i have looked at it but i cant see nothing broken.. could anyone please help me ????