1997 Chevrolet C1500 "cat spider" Questions

I keep getting code p0420. I replaced 2 cats, all 4 o2 sensors, plugs, wires, cap & rotor, cleaned air filter, sprayed maf sensor, new fuel injection spider, 2 mufflers. What is the problem? are ...

...spider with new unit nothing changed problem remained the same removed the exhaust from header to check to see if the cat was clogged no change they are 2 years old .Where do I go now OBD read ...

cat, o2 sensor,massairflow sensor,fuel filter,plugs,wires, distributor and rotar,air filter,spider injectors,not the module on top though, cleaned throttle body and sensors with carbon cleaner checked

...spider injectors i changed the fuel regulater it stil ideld rough but ran ok after 1200rpm then started bogging after an hour of running then the cat was glowing red so i cut it out then ranit again ...

LOSES POWER UP HILLS DID TUNEUP SPIDER INJECTION AND CAT try changing the fuel filter have the injectors cleaned up and chek for damaged or worn distributor shaft gear, that could be your main problem

...it fails. After replacement run SEAFOAM in gas ( and oil ) to clean out Carbon, fuel system and ...

...fuel spider. causes fuel not to work properly in some cylinders and causes lean conditions over compensation by computer and some run rich and cat gets runned, also over drive lockup will not ...

spider. I did a tune up on it, plugs, cap, rotor (wires ohmed out good), and ignition control module, but it'll die when it get hot, and won't start for a while after words. There is also a hesitation

spider fuel injectors so by the time I changed those out the cat and muffler were toast again. Now to present time, I was told the old trick of cuting the cat off and putting a straight pipe, So I'

spider injection. big pain. let me know. Got a blown injector if it's the throttle body type replace the injectors. $198.00 for the pair. Check the throttle plate and see if its sticking and if it has