97 dohc 134 code
 

134 code is o2 sensor down stream is inactive.changed out o2 sensor(4-wire)
twice and cat once.still getting about code after about 20-30 minutes of driving.when cold has hard time starting if i dont hold gas pedal down,warmed up is ok.thought injectors might be dirty,have added injector cleaner,have drove about 20 miles or so but no change!

Replace the ECTS sensor, sounds like it's gone bad. While you're at it, replace the connector as well. Use OEM parts - cost a bit more, but they work so much better

Thanks OceanArcher ,I already tried that yesterday still no change.It also rev's to about 2 grand when shifting from d to park.Once code is thrown does'nt want to idle in drive.

I do believe P0134 is

P0134 02 Sensor Circuit No Activity Detected (Bank I Sensor 1)

Which is the front O2 sensor pre cat not post cat

It's hard to start cold because the A/F mix is way off,
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Change Front 02 sensor. Use the Denso part -- the bosch ones and the universals suck in my experience