2000 F-250 6.8 v10
 

So I had my spark plugs and coils changed Saturday and ever since it feels like my transmission is slipping?? Is my transmission going out?

Welcome to the site..

How many miles on the truck/trans?
If you had no prior indication of a trans issue, could be a misfire/s are mimicking a slip. Generally a trans slip will generate a DTC. As would misfires. Was the battery disconnected prior to the work done?

2000 f-250
 

No the battery was not disconnected, it had no signs of transmission issues. And I'm at 194,000 miles
Also my check engine light just turned on this morning. I'll be checking it later today since I'm at work.