Car dies after changing exaust manifold

I replaced it because the muffler support broke and was hanging only by the exaust manifold and then manifold broke, I put a new exaust manifold and a new egr connection tube, all the holes lined up correctly I took it apart twice and tighten up really good I even bought the original gasket for the manifold coz the one it came with looked really cheap, I am going to check how tight is that egr conecction tube and ill get back with a response thanks in advance

Well I checked and re-tight all the bolts for the exaust manifold and egr conecction, I still have the same problem this loud noise coming out of the air intake (it sounds like when you blow air on a coke bottle but louder)my car keep idleing up and down and eventually dies also still smell like gasoline. No luck so far :(

Egr is valve is good I replaced that one 2 months ago I tested is close I checked the egr solenoid as well test good, I already checked all the vacuum and emission sensors all of them visually and with my multimeter ( fluke 725 ). I checked for leaks from the exaust manifold and have none ( I had my brother blocking the exaust pipe while the car was runnning I was checking at the exaust manifold I used somenthing is call snoop, is use for calibration on transmiters pretty much is destilled water with a mild soap), im wondering if a defective fuel pump would cause all this headache or maybe the fuel pressure regulator, I hear the fuel pump as soon I start the car, I dont know if the fuel pressure regulator is not regulating.I dont know anymore

Well I finally found the problem it was the egr, got a cheap brand online and the noise still there then I got one from the dealer noise went away car doesn't idle anymore thanks for your support