I just had Bosh platinum plugs installed and a new wire set. I also added a new high flow air filter. While driving today, car felt sluggish again and when I got on it, a black cloud of smoke came out. When I filled up my tank with gas, my car could not go past 10mph. I pinned it and it would not go anywhere. I pulled into a parking spot and reved the engine. Black smoke kept coming out. This happens a lot after I get gas. When I came out of the store it was running better. What can be causing this? I told my mechanic and he thinks it is a fuel issue (the car is getting too much). Your thoughts are greatly appreciated. It happens spiractically, but when it does it is scary! I think the bulb is out on the computer and that is why nothing is showing up. I am bringing it to him on Thursday night.