today i drove my truck on the beach and no problems. everything went fine... [i have an automatic] ....on the way home i was goin about 60 and i had 2 - 3000 rpms and as it was up shifting it sort of stopped accelaerating to up shift..but the rpm guage went all wild and went from 2-4000 and back to 2000 rpms like wild and my truck was like sort of bucking.. and the check engine light turned on and then went off rapidly..any body knows what this is? please help me out..im 17 and extremely concerned