Please help. 1998 sienna won't start...

[saung98sienna]

I never had a since I installed a used engine recently. I just did and oil changed last then a week ago. this afternoon I drove over a railraod track pretty fast, didn't see the big bump. I did not hit anything but went hopped pretty high went I went over the bump. Ater I went over the bump I felt the engine lost power, I gave gas, it wouldn't accelerate, the engine run very rough, the check engine light came on. I pulled over, looked under the van, no fluid leaking, not a sign of an scrape underneath the van. The did start up, ran very rough, put in drive it would just rolled. I had it towed home. I checked if I was getting fuel, fuel is ok. I took off the air box and tried to sstart the van, kept trying and trying then I see some white, mist of smoke coming out from the intake tube. Is my engine gone? Any advices would be really appreciated. thanks.

[arturo]

Hi maybe u should check ur battery terminals, i remember once ours didnt start up the terminals "looked" tight but were actually, slightly loose. Try tightening them.

[Qslim]

If the check engine light came on, you should start there by retrieving the code. Your car is trying to tell you something.