I have a Toyota Camry 94, it failed its emission test today with 2.62 HC GPM(Limit is 1.2) , 56.87 CO GPM (Limit is 15). The car also won't rev over 4000 RPM and acts as if it has a governor on when it hits that RPM, it will shift gears just fine when you don't have the pedal pressed down too hard.
It started when I left a parking lot and went over a dip in the road a little fast and I heard the bottom of the car scrape. Since then the engine sounds much louder than usual and the RPM problem started. It also feels as if it has lower power than before. There is no check engine light. (It came on a month before the problems and I replaced the air intake tube that was cracked and it went away but hasn't returned.)
I'm assuming these are related but would rather try and figure out the problem myself and fix it rather than take it to a repair shop.