Here are the symptoms:
1. The air filter gets clogged really quickly with a black soot.
2. It backfires and puffs out a little cloud when I shift from first to second. Sometimes it does this when shifting in the other gears. Sometimes it backfires when I back off the gas.
3. It gets really bad gas mileage. I was hoping for at least 20 MPG.
Other than this it runs pretty good!
I\'d say it sounds like it is running rich but I couldn\'t find a mixture adjustment in the Chilton\'s manual. All I could find was a backfire valve.
I\'ve already replaced the plugs, wires, and even the distributor (my son knew of a junker celica with a 20r).