Hi I bought a 97 sidekick sport, 4wd,1.8, auto... Unfortunately the last owner cut off the cat... Currently the vehicle is low on power, sluggish, and pings....it seems like it's running lean and not enough fuel??...I just changed the plugs and seems to definitely be running lean the plugs were very white in color instead of light brown that they usually should be... I also recently changed the fuel filter also ...the CEL is on but has been since day 1 due to cat I'm figuring??....I'm considering replacing the whole exhaust front to back with new cat also and new o2 sensors.... I'm thinking that 2nd 02 sensor is reading rich due to no cat and leaning out ECU??... By replacing exhaust and cat and 02s does anyone know if this would help my lean issue ? Before I spend the$$$ to bring it back to where it should be??.... Really wanna get her goin in the right direction with power and no pinging... Any info greatly appreciated!!!