I need some help. I parked my completely stock ‘89 IROC w/305 TBI with 65k miles on it about a year ago as I was working out of town. When I parked it, it ran perfect.
I went to get it out of storage after about a year and found that while it started right up and ran, it would not idle. I got it out on the highway and it ran well with no hesitation while accelerating or driving at highway speeds, but would die as soon as I let it drop below 1500 rpm. I went through all of the postings I could find pertaining to a TBI idle condition and found that my problem appeared to be most likely related to a faulty IAC. I replaced the IAC but I still have a “NO idle” condition. Engine temperature has no effect on the lack of idle. There are no cracked or missing vacuum lines and no check engine lights or codes given. The car runs great as long as the car is above 1500 rpm.
Any suggestions would be appreciated

 

Is it throwing any codes?

 

Nope. No codes and no Check engine light.

 

Have you check fuel pressure?

 

How old is the gasoline?

 

No, I haven't checked fuel pressure. I can hear the pump run and I'd think I'd have a problem with acceleration if the pump was bad. It will fire right up and when I get it on the highway it will pull strong as long as l stay on the gas. When I've had fuel delivery problems in the past the car would stumble and refuse to accelerate. I'll see what I can do to check it. Any suggestions on what should it be?

 

About 3 months old. When the problem appeared, I took and filled the tank. No difference.

 

Should be 10-13. Mine had similar symptoms way back in the day. Turned out to be the host between the pump and sending unit.

Ran fine except wouldn't idle. Didn't know it, but it was leaning out everywhere

 

Ok, I'll try to check it out this weekend. When you had the problem were you showing any codes?

 

Nope. Non at all

 

Ok, I'll let you know what I find. Thanks for the help.