1992 Toyota Paseo Engine Will not start, but cranks

My car started fine mostly, but recently it got really cold. Like 12 degrees, and now it won't start. I checked the plugs for spark and it had plenty of spark. Fuel seems to be getting to the plugs as i've taken them out numberous times to clean them and put them back in and each time they had fuel on them. The timing belt seems to be in good shape. Now before the car would start and it would sometimes have a roughness to it for a split second then straighten up. Im beginning to lean towards the fuel filter? Also before when I would coast the car would jerk until it coasted down to about 40 mph, now im not sure if that goes hand in hand with my problem or not. When the car starts it runs fine except for the coasting, but now im just trying to get it to start. Perhaps fuel pressure regulator? Any help would be appreciated