The severed MAP vacuum line alone could cause all the drive-ability issues you have been experiencing, figures always something simple in the end eh.
You can go to Pick & Pull for allot of those little vac lines and such, if your not up for buying the replacement parts from the dealership. Or you could build your own with the silicone hoses you can get cheap on eBay, or from local part stores for not as cheap. I bought 10 meters of the silicone hose on eBay for 10 bucks, to use for vac lines with my turbo conversion the stuff works great.