hey guys my 94 camaroz28 has a really bad shaking problem when i give it some gas it backfires i think it might be a missfire but not sure..if any one out there had this problem and found out what it was please please let me know or if any one have an idea what it might be please please let me know...thanks

 

you think it might be my opti that is no good?...but i just had my tune up done with a new opti about 4,000 miles ago??...thanks