gota 2000 gt 1zzfe its really hesitant when you give it gas, and wont do sshit at wide open throttle, the tranny hesitates to shift as well i replaced the coil packs and spark plugs nothing, the obd coad reader said code
po300 random multiple misfires-thats why i changed coilpaks
p0171 system too lean- could be 1st o2 but dont want to buy it and find its not
po420-catalyst effeciency-does this mean the cat if fucked
i looked for vac leaks nothing its like the cars air fuel seems all fucked up like too much air not enough fuel also i cleaned the maf but could it need replaced. basically i cant go replacing all this stuff, to seee what works soo any ideas ask me Q's ima stay on this thread thanksss

 

run a comp. test on it also you can give me a call i'm kind of the goto celica guy in tampa 813 716 9025
justin