It's a 5 speed.  The timing belt and valve seals have been changed sometime within the last 6-8 months.  The "bucking" is more so at lower rpms and in a normal driving manner.  He told me it acts as though it wants to stall.  He also said at higher rpms it doesn't do it.  I thought at first it was tps or iac.  I really don't know what it is now.  Never really fooled with avengers much.  My 96 neon done this and after changing two sensors that were bad it still didn't fix it.  It ended up being a short in the electrical system. 

My father in law is trying to figure out why his wife's avenger is bucking.  He had code for misfire in cylinder 2.  He's changed the coil pack, plugs, wires, all that excrement.  We are going to try a new injector.  Do all years avenger use the same injectors?  This is the 420a.  I've seen some on ebay for a 95 but don't know if it will fit since hers is a 97.  If that doesn't work I told him it was probably in the wiring (cps, asd relay, short, etc).  Any help is appreciated.