I have a 99 suburban 4x4 that I recently purchased. When I bought it and
took it on the test drive, it shifted perfectly, after driving 250 miles
the check engine light came on. After paying a toll the trans shifted hard
from first int0 second. The problem is the trans does not always shift
hard, usually only after highway driving. I have already changed the fluid
and checked the code. it is a trans code. Anyone ever have this problem?
Need a solution