Lately I have been having a problem with accerlation under full throttle. Normal driving is fine and on the highway accerlation is fine. This just happens at a stop. I am only getting 10" at idle when in drive but goes up to 15" when in park. The car is strugging to get to 3K but once its there the car throws you back into the seat. The heads that are on the car are stage 3 ported and polished when I bought them there was a reciept for about 1000 worth of machine work. The previous owner had a custom cam but didn't want to sell it. I was told that the stock cam would be ok. Car is acting like there is a vaccum leak but can't find one. Just wanted to get some other opinions if it might need a different cam because of the higher flow rate of the heads or if I need to search harder for a leak. Thanks for the help.