[supradaddy0803]

Well there is a lot of questions to be asked here. If you smell gas then you are running rich. This could be caused by it actually missing and one of the cylinders just throwing the gas right back out of the exhaust. As for your exhaust it shouldnt throw off the A/F it will make a difference on HP though if you dont have enough back pressure. I would check you distributor cap rotor check the spark on the spark plug wires and check your plugs. If it is missing as bad as you say then when you pull out one of the plugs it should smell like raw gas. this would be your missing cylinder. If you havent replaced the wires or the cap and rotor I would just go ahead and do it. LOL I think I have a new cap sitting around I never got around to putting on my 7M before the swap they are only like 12 bucks. Also check your timeing with a light may be off but more than likely it is your plugs or wires or cap. My on 7M used to do that when I first got it. Or when I get a chance I could drop by Waco and help you out and we could go spank those Mustangs in my 1JZ beater lol they will never see it coming.