we have a 89 camaro that we just put a motor together for,it was an rs so had the stock 305,the motor in it is a 350 roller with the 305 heads,computer,and efi system,it sounds like it's taking in too much air and runs pretty rough until you have it running for about 10 minutes and then it levels out,any ideas of what it could be or does it just need to be tuned.