T-350 shifting erregular
 

hi all, i have a th350 that has been rebuilt and now is not shifting correctlly. it shifts fine if hard on the gas peddle. but if just driving normal it shifts and then down shiftsonly when going from 1st to second. if it gets into drive it will hold in drive. kinda driving me nuts to drive the truck. ANY help will be awsome guys... thanks

Modulator !! well hopefully lol ..... check for proper vacuum to modulator ...... next after it works normal and proper ...hook up the kickdown cable lol