EDIT: new problem w.t.f Now it goes into closed loop nomatter what after like 5 seconds of running... so frustrated
Can someone please help me I am trying to fix my car I just bought it a month ago its not running good cold and runs rough when its warm. it backfires through the intake and idles between 900 and 1000 in park sometimes it stalls when cold. when it is warm in drive when i accelerate it hesitates then it is good. Heres what i did to it
Replaced:
the mass air flow sensor
O2 sensor
Electronic Spark control mod.
Wires
plugs
distributer cap
rotor
air cleaner
oil change
fuel filter
oil filter
adjusted the timing

if i think of anything else i will tell you

THIS IS A TUNED PORT INJECTION V8 305 from a 1985 trans am i am not familiar with this type of fuel injection

 

Have you cleaned the throttle body and IAC?

 

i cleaned the throttle body but im not sure what the other thing is edit: i cleand both took off the whole throttle body.

 

This seems to be a very common problem with several different solutions.

https://www.thirdgen.org/techbb2/sho...hreadid=271931

https://www.thirdgen.org/techbb2/sho...hreadid=274785

Just 2 of many...

I replaced CTS, ATS, IAC, TPS, fixed a vacuum leak, replaced the fuel filter, removed and reinstalled the eprom in the ecm, rebuilt the distributor and replaced spark plugs and wires, cap and rotor, blocked off the egr at the plenum, cleaned the throttle body, sent the injectors out to Rich at Cruzin' Performance to be cleaned. These last 2 are where my problem went away. Finally!

 

 

I cleaned the iac it did nothing, i am not sure where to go from here the manifold vacuum when cold is 10-12 and is at an idle of 500-700 when it isnt stalling on me, when warm it idles ok around 900 and the vacuum is at 18-20, the fuel pressure is at 38 psi
IT RUNS REALLY RICH