My car misses at about 2500rpm's pretty bad, but it doesnt do it until its warmed up. What could be wrong with it?

Bad spark plug wires and while your there put spark plugs in it if they haven't been changed

That was my first thought, but i figured if a spark plug wasnt firing right it would do it all the time, not just after it warms up. But that will be the first thing i do. Couldnt hurt even if it doesnt fix it. Thanks

The plug wires are the problem. They break down under a light load usually when it shifts into overdrive or in fifth gear. I just figured since you were there go ahead and change the plugs.

I definitely will, & yeah its a 5speed