Got a 95 Z28 and it runs fine when cold, but once it gets warmed up, hesitates like a SOB.
It's acting like a bad opti, but I'm praying it's not. We just replaced the opti in this Aug. of last year (maybe 4K mi. ago).
I'm gonna take it to Autozone and have em run codes on it tonight.
Is it possible that it's anything other than the opti? I think I will cry if I have to replace that twice in less than 6 months.

Thanks,

J

 

Mine was the O2 sensors. It was real bad when warm. No it runs like a dream. Cheaper than an opti to so do that first

 

Same problem here and I also replaced the opti. I posted a few times and didn't get much help so I'm hoping for the two of us you get some good responces.

95Zdroptop- Where was your hesitation in the rpm range? Mine is mainly in the 4-5k rpm. I also get it under load sometimes in 5th and 6th gear at low rpms 2k-ish.

 

Ive still got the problem and Ive replaced almost everything but the opti. However I had my PCM programmed last week and it runs much better now, but I still have the shaky idle.

 

Mine was mostly under a load in any gear. 2000 rpms and below.

 

Very common for the LT1 to do that. Have you done the normal free mods yet? Such as TB Bypass and Manual Fan Switch, they both help a lot...

Do a search plenty of info for you to find...

 

Had diag. ran, apparently it's the ect.
I'll admit, that caught me by surprise, especially considering we replaced that a month ago

J

 

ect=?

 

ect= engine control thingie

 

excuse me, ect sensor
-engine coolant temperature

J

 

duh, I was just having fun

 

That was meant for the other reply, not yours

J