I just recently rebuilt my 2000 ram 1500 5.9l v8 and i am havein trouble shifting in reverse. When I do it stalls out. When i shift into drive it runs fine. I have adjusted timing and no fix. If I adjust the throtle valve cable I can almost get it to stay running. Can anyone give me advice or am i in the wrong area for the problem?? Also I have No codes comming up and no check engine light