Charge your battery over night , start the engine to warm it up , take out all the spark plugs , remove your fuel pump relay ,prop your throttle bodies open and test each cylinder again . i put alittle oil on the oring of the tester end that screws into the spark plug hole to insure a good seal while testing . All of these step need to be done to get an accurate reading . then report back .
note : do not put any oil in the cylinder as the oil will seal around the rings and give you an inaccurate ( higher )number and the motor must be warm or youll get an inaccurate ( lower ) number .