So when i start my car, it RPM's at 4500 RPM which was the normal range. NOw it RPMS at 3000 at max Revving, and it sounds like its choking, not enough air going in. i changed the spark plugs, and i dont know what else to do. And another thing when i drive it, it goes around 25mpH max even though i floor it all the way. Please Help =)

 

well check the basics. You already did the plugs, check the coils for spark, check the wires, check the fuel filter, get the fuel lines pressure tested. If that all checks out, I would say a computer problem maybe. Is the SES light on, any codes?

 

Possibly the cat is plugged.

 

I'm thinking you got a bad bad problem with your Fuel Pressure Regulator lol.

 

well the check engine light is on, and it has two codes. one is the 5th piston misfire and the second is the evab sensor.. and idk wut to do next..