first its a 95 tbird 4.6 has 4.10 gears , jmod,and exhaust. every once in a while when it goes to shift from 1 to 2 it acts like it hangs up part way between gears. it did this also with the stock 3.08 gears. will do it if in auto or manually shifting at part throttle it usually acts fine. doesnt do it all the time. any ideas what may be causing it???