Hey, i brought my 94 z to the dealership about a week ago to get my heat fixed. they put in a new waterpump and thermostat for me, so now my heat works great! Ive been noticing my car accerlates slower than usual and RPMs r higher sometimes too. my father and i took it out and he noticaed it wasnt downshifting correctly, so he thinks it could be a vacume issue. does this sound right? any ideas would b great, thanks

 

I know older auto trans were controled by a vacum line but the autos is the 94+ are electronicly controled, hense the e in 4L60e sorry