Help!!......Please

I finsihed my h/c/i swap and my car doesnt quite run right. There is no power under 1000 rpm and it barely stays running. Also I had to keep giving it gas for five minutes when I started it this mornin (under 30 degrees outside) to keep it alive. It does not have near the power it should have for the mods I put in, it feels weaker than stock if anything. The timing is set relatively low, havent had a chance to adjust it. The problem didnt seem to happen when I had my stock h-pipe on but I only drove it once before I put the o/r x-pipe on. I didnt hook up the tube that went into the cats on the h-pipe when i put my x-pipe on, I dont know if it throws off some sensor and puts too much fuel to the engine; which seems to be the problem because the fumes seemed very rich in fuel when it was warming up this mornin. Fuel system and MAF are stock if that helps any. Im open to suggestions, Thanks if you got any

I just remembered that i never plugged off the hole on my cai where a hose went to the valve cover. I'll plug that off and see if makes a difference.

Didn't help. Plugged off the hole and went for a test drive. No power at all, back fired when I gave so much gas, and ran horrible trying to get above 1000 rpm in 1st. I might tinker with the timing when I get time.

The timing was 180 out but I fixed it. The car will idle ok when its warm and sounds mean. It will also drive decent, except for the lack of power, once I get over 1000 rpm.