I have a 1981 rx7 s model I just put a motor (12A It still has the rats nest) from an 83 gs into it. the motor ran fine until the swap. now I can't get it to idle at less then 2900 rpm. I have checked for vacuum leaks around the entire motor, I spent five hours doing this so have checked and double checked for leaks. so now I believe its the carb please help. I am willing to do all the baby steps to figure this out.

 

How's it run at 2900 rpm? have you checked the adjuster nut on the throttle cable? you should have a little slack on the cable.

 

it runs OK at 29 but slowly dies after that yes have checked the throttle cable have just a little bit of slack on it also checked to see if the choke was sticking but no go there ether at 22 it starts to stutter and completely dies at 13 thanks Brian I'm sure you or code blue have run into this before so your help would be greatly appreciated

 

check the #2 AAV hose.
https://www.rx7club.com/1st-generation-specific-1979-1985-18/hose-question-750125/

 

checked it a couple of times but will again have also checked coils dizzy cap and rotor plug wires spark plugs igniter's and the entire rats nest for vacuum leaks and as stated before the throttle cable the choke and the hot start assist all in working order but I realize this will probably turn out to be something simple I have over looked

 

you where right turned out to be the AAV put oil on the ends to temporally check the seal and was able to get the idle down to 1500 now I can time the car thank you will put hose clamps on it to fix the problem I knew it was going to be something simple to over look

 

ok we took it out for a test drive and we think the CAT is pluged. the car is GUTLESS, the CAT was popping like popcorn and smoking like it was on fire, but it wasn't. were getting good spark from the coils we are going to be rechecking though.oh this is off topic but we got the electric sunroof working. the previous owner had "porcupine wire" jamed into the fuse box.

 

update: shutter valve was toast secondary linkages were hooked up wrong and the cat was clogged and the aav#2 hose was leaking now it idles and drives thank you all for the help jogging my beer soaked memory

Alex