[vettennn]

I've been having this problem with my lt1.. 1992, it runs fine until it gets to operating temp. Then it starts to miss and kinda buck. Had check engine codes. They were for the intake air temp sensor.I replaced that and the throttle position sensor and it still happens. It's not over heating and everything else looks normal. 93,000 miles on it. Just replaced both o2 sensors and it still happens. I'm done now and I'm bringing it to a shop on Fri. I'll let you guys know what it was when I find out. The opti spark distributer was shot.... After paying $850.00, it runs great!!!

[slrvette]

I moved this here for you. You should get a better response.
Did you set the TPS when you changed it?

[vetteoz]

Originally Posted by slrvette

Did you set the TPS when you changed it?

Not adjustable on his car; ECM takes "key on" TPS reading and uses that as base figure

Originally Posted by vettennn

it runs fine until it gets to operating temp.

What temp?
Sounds like you have a problem when computer goes into closed loop and uses the O2 sensor

[toobroketoretire]

Originally Posted by vettennn

I've been having this problem with my lt1.. 1992, it runs fine until it gets to operating temp. Then it starts to miss and kinda buck. Had check engine codes. They were for the intake air temp sensor.I replaced that and the throttle position sensor and it still happens. It's not over heating and everything else looks normal. 93,000 miles on it. Please help....

It could be a faulty O2 sensor.

[jmaki]

Originally Posted by vettennn

I've been having this problem with my lt1.. 1992, it runs fine until it gets to operating temp. Then it starts to miss and kinda buck. Had check engine codes. They were for the intake air temp sensor.I replaced that and the throttle position sensor and it still happens. It's not over heating and everything else looks normal. 93,000 miles on it. Just replaced both o2 sensors and it still happens. I'm done now and I'm bringing it to a shop on Fri. I'll let you guys know what it was when I find out. The opti spark distributer was shot.... After paying $850.00, it runs great!!!

my 84 vette started doing the same the other day---runs fine then when warmed up the idle drops very low and it starts chugging. I replaced a O2 sensor a couple years ago. anyone have a comment before I take into shop? lagmak

[robs1988]

Originally Posted by jmaki

my 84 vette started doing the same the other day---runs fine then when warmed up the idle drops very low and it starts chugging. I replaced a O2 sensor a couple years ago. anyone have a comment before I take into shop? lagmak

Same thing for you; closed loop problem. Check engine light on?

[toobroketoretire]

Originally Posted by jmaki

my 84 vette started doing the same the other day---runs fine then when warmed up the idle drops very low and it starts chugging. I replaced a O2 sensor a couple years ago. anyone have a comment before I take into shop? lagmak

Your O2 sensor may have failed already. Or the wire on it came unplugged. I'd check it out myself before taking it to a shop.