i have this problem , when shift to reverce and acelerate the engine start missfire but shift back to first shift , runs fine. anyone can help?

 

that might be your reverse limiter? so you only go a certian speed in reverse.

 

Yep, it's the reverse rev limiter. It's supposed to do that. Do a google search for "disable reverse rev limiter" and you should be able to find out how to manipulate a couple wires to eliminate it if it bothers you enough.

 

yep reverse limiter sometimes it can affect 1st gear tried to eliminate it but blew the fuse gave up on that