I have a 96 jeep Cherokee 2D 5speed 4.0 with 244,000 miles just recently i got a CEL for cylinder 2 and 5 misfiring I changed all the the plugs and wires cleared the code and within a few days it came back on for the same two cylinders so I put a new cap and rotor on it cleared the code and so far so good but I noticed when I get on the highway to drive 35 minutes away when I’m going about 70 mph and only after I have been on the highway for about 20 minutes or so it will start to what feels like a misfire randomly unless I let off and go 65mph. It feels like the whole motor shuts down for like half a second and when it comes back it almost kicks it’s pretty rough and it’s not through if a code and no CEL so I have no idea.i can’t wrap my head around what it could be why is it only happening at 70mph why only after I have been driving for about 20 mins wnd why no CEL. Has anyone had a problem like this or have any idea of what it could be?

 

Pull the cap off and check the distributor shaft for play. Might not be it, but its easy enough to check.