The Sunday after Thanksgiving I was driving in bumper to bumper traffic from mass to nyc and everytime the car would shift gear from 1st to 2nd or 2nd to 1st at exactly 20mph the car would jerk alot until it was above 20mph or below 20mph. I am not sure what is going on there but I had the transmission rebuild almost 2 yrs ago.
Now today I had the car in park and the car started to shake and it almost turn off.
What could it be? I though everything was perfect, the car has no vibration and is in top shape.
I am thinking it could be bad gasoline but what does that have to do with the transmission. I fill up the tank with Mobil 87 going but coming back I use Hess 87 and that's when I noticed the problem.
any ideas?