i just got a 300zx pcm and instaled in my 85 maxima. i took it for a test drive and she responds whay better the, the tack of it grate but when its time for it to shift she lags it and dosent shift , she just reves up and slows down. oh my tranny is a bite f-up put she didnt us to lage it that bad when i had the maxima pcm.
what could be the problem?

 

i for got to say that wen floor the car when i test drove it. it reaches 5000 rpm and then it starts to lag it use to reach 6000 rpm withe tha origenal pcm.
and shes auto matic