ok i have a :
1991 da integra
stock jdm b16a head
jdm gsr block, and crank, bored 81.50 with 81.50 ctr pistons
315 dsm injectors
p28 chipped ecu

problem is when i start the car(this is on a cold start) it goes to 1300rpms then 10-20 seconds later it drops to fluctuating 650-800rpms. as it sits there and warms up it fluctuates a little more 500-800, so it's seems to have a harder time idling properly as it warms up. i have been stuck on this for almost 2 months now, so any and all help will be appreciated.

 

are you throwing any codes? check your map sensor.

 

not throwin any codes.

 

Id ohm out your iacv and fast idle valve

 

put factory injectors in along with a non-chipped vtec ecu then start testing
-clean iacv
-screw in fitvalve
-bleed coolant system
-check for vacume leaks/vacume routing
-report back

 

I put factory injectors in, but didn't have stock ecu. Car ran almost exactly the same. Just idled a little low. Checked and rechecked iac,fitv, bled coolant,changed thermostat