OK, I've finally completed my Timing Belt install, but I think I've got a big problem! After it warmed up for a few minutes, the engine runs fairly smooth, but the check engine light is on, and the exhaust is back-firing and smells WAAAY too rich. I took it for a very short drive, and it feels hesitant upon acceleration and there is a lot of vibration when it's in gear.

I'm pretty sure my timing isn't out of phase - I followed the directions that VCrossfan provided me, along with Randy's HowTo, and I thought everything went fairly smoothly. I'm really hoping that maybe the computer just needs some time to readjust, but I don't want to run it too much without consulting the experts here.

Please, any advice would be appreciated.