D15 Bogging down in first gear

on my 91 again last night it started doing this thing where i let out on the clutch in 1st and it damn near kills it it just got a tune up thursday new plugs wires cap rotor and valve cover gaskets cause they were leaky its been runnin great till last night i washed it but not the motor and it started doing it by the time i got home it was acting normal and now it did it again on my way to work this morning confusing for me appreciate the help guys