Hey hopefully someone can help me get to the bottom of this. I have a V6 1995 Mustang. I have a flowmaster exhaust with an h pipe on it. I also have a K&N intake in it. Right now since i put the K&N filter on the check engine light is on. It's always had relatively bad gas milage too(17 in town and 24 on the highway). Before i bought it the engine was changed at 80,000 miles and it now has 120,000 on it. When i first start it up the rpms will drop and almost cut out. Then it recovers and idles fine. If I'm at a stop sign and give it some gas it hesitates a lot. Its like i didn't push the peddle down then it picks up again. I'm just not real sure where to start. I am thinking it could be my fuel filter and I'm going to change that tomorrow. Anyone have any ideas.