jolting??

i have an 88 gt. it is a 5 speed manual. today the car starting jolting pretty badly at around 2000 rpm, but after about 3 or 4 shifts back and forth it stopped, and has driven fine since. today was very raining so im thinking maybe it could be bad wires... what do you guys think.

do you have mass air intake?
if so it might have taken in water they do that and the jolting is usually a result if that is the case its nothing to worry about just try to avoid puddles