repair cost on 2000 Chevrolet Venture

my car recently had a transmission repair about 8 months ago, recently about 2 weeks ago my car started pulling and slowing down and cutting off. One friend checked it and said my emergency brake was on. I didn't know however the car was driving just fine. I took it to another shop to check out the problem. What could be wrong? Oh and I was waiting for extra money for a tune up which was overdue as well.

Asked by for the 2000 Chevrolet Venture
definetely not a transmission issue, would need to have driveability diagnosis done for $70.00