Alright, I had this problem before the block swap, I installed new block, still have the problem, maybe even worse now. Need some ideas. Stumbles on deaceleration, occasionally stalling out.


ICM has been changed
Coil has been changed
pickup coil replaced when brand new distrib installed 1 year ago
TPS checked, set at .54
EGR removed
cat removed
injectors have been changed due to engine swap
timing chain new due to engine swap
timing set at 12deg, should be 10deg (dont see this being problem)
CTS has been changed
vacuum was fine last week
distrib cap looks good
plugs new from engine swap
sp wires appear to look good

 

Crap *** gas. I just went through that... drain the tank, and fill it with some good BP or Chevron 92/93, if you can... just to eliminate that from being a factor.
Also, check your fuel pressure.. I'm thinking it's fuel related

 

Clean and check ur idle air control! I had the same problem. Dissapered with the new one in.

 

Ok, I see few things I missed

ECM has been swapped around, didnt change it.
fuel pressure AFTER engine swap was 40 w/o running, 38 running. I have since swapped rails, but havent checked it. Will do. Maybe need new regulator, or shim it.

I cleaned IAC tip/passages while engine was apart. Maybe I need new?

keep suggestions rolling.

 

You may want to check the fuel pressure with the book. I think that its a little low. Right now mine sits at 42 at idle, 47-49 at WOT.

 

New test...

fuel is 42 car off, 39 car running, revs to 44psi
vacuum is steadier then it was last week at 18.5
timing is 13deg

 

What about the IAC?

 

I think IAC will be on my list when I get payed.

 

25$ good luck

 

85.30 plus tax for me

 

I'll send you a couple of mine, but that only effects the idle. I would check your injectors. If the car was running rich won't it cause this condition? What is your O2 meter running

 

thanks for offer t, but yours arnt the same as mine.

Running rich problem is fixed, damn me trying to re-invent the wheel

Injectors are fine, o2 meter is usually a little on the low side now tell I bump pressure up the next time I feel like taking the intake off

All I'm needing is an idle fix.

 

Almost 100% sure the IAC will do the trick

 

almost j/k, I hope it is, getting tired of having it still in rush hour traffic