I got an 85 Iroc with rebuild 406 engine. I swaped my injectors to 30 lbs/h. Anyway when I broken my engine, I had the stock prom and ecm (870) and the car ran ok and it was somewhat drivable. then, I swaped the ecm to 165 and modifed my stock wirring. for the prom, I used 6E and I disabled vats and changed my injector to 30lbs. now My car does not idle at all, and if I step on the gas my rpm goes to 1500~2000 rpm. I check the wiring few times and it seemed to be good. What could be wrong??
Thanks, Ivan

 

wow, you converted over to a 165 ECM (my 165 SUCKS), see if you can plug in a scanner and get any feed back, this is very inportant. You might have crossed wires or you might just need to tune the chip. My guess is your 6e bin is in need of big time tunning. also i think you need to post in the prom boards.

Whats your specs on the motor? you're gonna run like **** if you have not tuned it.

 

well I went over the wires few times, and they seem to be ok. I am afraid if my ecm or prom shot. I am not sure why my car ran ok with 870 ecm with stock prom. anyway my engine specs is 406, 9.5 cr cam 224 224 @.050
Dur Adv. 291 287 Adv. Valve lift .450 .460 LSA 114. injectors are svt 30lbs. SR torquers heads. like what I said before, I only disbles vats, and change the constant of the injectors to 30lbs and nothing else.

 

my guess is a tune. did you go from mass air to speed density?

 

Ok I figured it out! the car was running on Limp home mode due to an ecm failure.