1992 lexus sc400 problem no power going uphill transmission changed on 2011 changed spark plugs lwiring gas filter cleaned trottle and today replaced catalytic converter and it glow red. and had no power going uphill. reason why the cat glow red was too much fuel in exhaust from engine missfiring.How do we fix this problem do we have to adjust or need to tune up. The engine is not missfiring but have smoke smell gas.