Quote Originally Posted by FordMan77 View Post
Start spraying carb cleaner around all the sealing surfaces (TB, S/C,etc) and all your new lines. One of them has got to be leaking still. Check the brake booster as well where the large line come from it. Sometimes the check valve can go bad in it.
i took brake cleaner and did this and couldnt get the motor to stumble or change tone anywhere and while i was replacing all of the vac lines i did check to make sure the check valve is working properly and it was. While i replacing the line that runs under the snout of the s/c i did notice that there was s/c oil on it so i dont know if i should pull everything off again and check the gaskets cuz im thinking the guy the did my new motor didnt put new gaskets on when he took the s/c off my old engine and put it on the new one. The only thing is, i dont see anything else leaking around the s/c besides the little amount of oil leaking from under the snout. The new lines did help though because i was only getting 8 or 9 in Hg for vac before the new lines and now im getting 10 to 12 and if i rev the engine while in park it actually gets more vac... pops up to 12 to 13 when i rev it now and before the new lines it would just drop down to 2 to 4. I dont know if it makes any difference in finding the problem but ive noticed that while im cruising down the road at 60 to 65 my vac is anywhere from 4 to 6 and then if i let off the gas completely it will pop back up to 13 to 14 while i just coast. i dont know if any of this even helps but i dont know to much about this and im just trying to toss things out there in the hopes the it will help someone diagnose what is wrong.