I swapped an 87 FI 13B into another car and finally got it running - it fires right up and appears to run pretty well - will tach up pretty decently when cold, but after it's warm, when you hit the gas it sputters and pops and after a couple seconds it will eventually rev up, but something is definitely wrong. It could be my wiring??? any suggestions what to check or any diagnosis??? please help - i'm stuck

 

what car is it itn? Not that it matters but i am curious

 

your timing maybe? check your crank angel sensor or maybe a bad sensor ?heres what most people say about this car check for vac leaks ,just throwing ideas out.

heres a idea what is that ensor that has thermowax in it>? i forgot the name of it.

 

vac leak

 

the motor is now in a 79 mgb. I removed the motor from a running 87 from a police impound. I tried to keep everything as stock as possible and all the hoses look to be in good condition. it starts riigh up and idles fine (runs a little over 2k until it warms up then drops to 900-1000. only when i hit the gas it sputters and runs like crap. i know there are those large solenoid looking things on the exhaust ports - i thought maybe those weren't working right - should they be opening when i hit the gas??

 

^same question should that rod go up when i hit the gas?

 

TPS. Out of adjustment or bad.

 

Those are you 5th and 6th port actuators. They typically open between 3500-4000 rpms. They will cause less performance if they do not open, but should not cause any hiccup when revving. It will just make you slower.

-Justin