I have a 1999 1500 club cab with a 46re and there seems to be like lag or something in first gear I'm not having any of other problems with 2 through 4 I'll push on the gas and it won't move I really gotta give it some to go any ideas

 

I would think your issue is due to the transmission linkage at the throttle body needing an adjustment.

 

Is it stuck in second? Try manually shifting it.

 

How do u manually shift?? No Idea and I'll see about adjusting the deal

 

Go to "1" on the shift indicator