Ok so i put a new engine in last year total pita btw everthing gave me trouble. so last fall when i was finishing it i had the engine idleing and it jumped into reverse. had to chase it down and jump in it before it hit my uncles brand new jeep it was pretty close. but thats when i descovered it didnt want to go all the way into park and it seemed like it would roll on a nonflat surface unless i pushed and held the shifter foward now with spring comming how do i fix that?