Just got it back fromt he mechanic a few weeks ago, replaced the transmission. Since we got it back, It shakes when u get to 50 mph, it makes a lot of noise. It also while on the freeway doesnt really jump, but has a hard time accelerating. I got to the store and as I put it into park the oil light came on and it died I couldnt start it, oil was ok added a little more, it got me home but has a hard time starting, I have to keep my foot on the gas petal. Any ideas on what it would be? I did check and there isnt anything indicating that the engine block is cracked and fluid is leaking into it.