druven more than 1000 mi and still nothing

can it be a computer thing

excessive vibration in drive shaft

i been having problems when accelerating from start. It sputters then will run good. also got two code; P1131 and P1151

My van has problems when accelerating! it feels like its loseing power and also vibrates at highway speeds! Had a full tune-up! Problems and check engine light is still on.
any suggestions?