It drives just fine going down the highway, and I have gone to more than one gas station. I also regularly use STP Gas treatment and last Saturday I used a bottle of Heet gas additive/water killer. Maybe it could be a distributor issue. I recently replaced the cap and rotor, but maybe its something else. I dont know if this is related, but whenever I rev up the engine (cold or warm) the car stalls out when I quit revving it up. I only have problems at slow speeds and when stopped for whatever reason (red light, traffic, etc.).