1993 Mustang LX 2.3 won't rev past 2k

Hey guys! So my little box seems to be fine until she warms up, then doesn't want to rev past 2k. It almost sorta feels like it starts chugging along like a ing choo-choo and starts making this gross sound that reminds me of misfiring, but not sure. I could really use some advice as she's my daily and I'd be fifty shades of **** if she died out on me all of a sudden. I replaced the fuel filter due to some friends' advice and it seemed to bandaid the problem for a couple weeks but she's back to this issue again. Does anyone know what I might be able to do to fix it, or has anyone ever had this problem? At this rate, I'm thinking of cancelling my insurance, ripping the 2.3 and A4LD out, and just replacing them with a 5.0 and T5 setup but that'd still leave me daily driver-less. Any advice or anything would be greatly appreciated!