so took my car in to deq today ( Portland Oregon) and it faild. The HC levels read 527 on idle and 599 at 2500rpm, CO reads 1.8 at idle and 1.4 at 2500rpm. HC needs to be at 220 and CO needs to be at 1.0. Not to sure were to start without spending to much money. I did ohms test on the fuel injectors, all read about 17.3, not sure if thats good at all, also dose it matter what order they are plugged in. all i have really done is switched the o2 sensor out, any info would help, need to start some where, 1988 firebird gta 305 tpi, Thanks

 

You might want to try the TPI forum instead of the Carburetor forum.