ok.. specs first of all

completly rebuild 4.3 tbi c1500 89 w/700r4

0.30 over, 9.6:1cr, edelbrock 3714 cam, performer (3713) intake, stock heads, 30deg cut on valves, smoothened ports, stock exht. all sensors and ignition new, msd blaster coil.

i have modified my stock aksb. bin, egr off, i have used winald to log my blm:s and got new values to VE map, added little spark for mid rpm and adjusted PE and AE values little..

result... in closed loop, when moving some decent speeds, 30-70mph, i got 14.5-15.3 afr:s on cruise, on light acc afr goes momentarily up o 16-16-5 afr and when adding more tps ill got it richer, 13.5 approx at wot its 12.6-12.9 afr

its not bad... but... from off idle or low speeds my acceleration is rather poor, rpm:s dont want to go up too quickly, its like having some 10 tons trailer on my tail... acceleration from 40 to 70 is almos twice faster than from 5 to 40 mph, and ill got only some 13.3 13.5 afr @wot...

but that not all, bigger issue is my idle, when open loop, in park it idles 1150-1230 rpm@ 33-38 map and 15.7 to 16.7 afr.. too lean, little stumbles... dont know if its bad or not but canot get rpm lower... i have adjusted iac steps down (4 steps when warm) and opened the flaps to get better atomization but still no help, winald shows iac value 22 so somethign else opens iac so i wont get rpm:s lower or am i completly wrong?

when engine is warm(rather warm, cannot get temp above 76C/168F) and been drivig in closed loop stopping in traffic or going in park, after some rpm drop in first few seconds it will run next 10 seconds decent idle... 700-725 rpm @ 14.5 afr and rather fine but soon afr:s goes over 16--> engine starts to stumble, vibrate and nearly dies, rpm( afr and map also) wonders around, rpm from 450 up to 900 rpm.


im rather new in prom tuning, just trying to learn but now i cannot understant what im doing wrong in the idle and acceleration values.