'98 Sluggish and jolting shifting/jumps in reverse
 

Recently my van seems to lurch then jump when in reverse. I have begun trying to park in places where I can just pull straight out as it is very bothersome. Last weekend my husband ran fuel injector cleaner through the van and this week it has begun having issues with being very sluggish when excellerating (engine revs, van hesitates). Once I reach 10-15 mph the van shakes and the speedometer needle quivers, then shifts... @ 25-30 it does this again... around 40-45 it does it again. Once I'm going at a good rate of speed it does okay... but stopping and starting in city traffic is crazy and the van does it everytime I have to stop.