Well this is new to me, My 88 gxl has a new trick. When im driving and i punch the gas the motor goes almost dead quiet and the car starts to coast, it also does this round 5k rpms. it seems like fuel and spark just cut out completely but the gauges are all reading the activity of the motor. This is so confusing to me does anyone have any ideas?

Thank you so much for the help,
-T-mac