85 GS Dies when pressing brake - help
 

Car Information:
1985 RX-7, 1.1, 12A, Automatic Transmission. Approx. 72,000 original miles.
Dropped gas tank, flushed it. Changed fuel filter, plugs, transmission fluid and filter. Ran Sea Foam in gas tank after cleaning tank and changing filter. Put "trans tune" (sea foam transmission cleaner) in transmission prior to changing filter and fluid. This car is near original condition with little of no modifications that I can identify yet. (I also posted this in another section about 170 views with no responses)


Problem:
Car dies when brake pedal is pressed or placed in Drive or Reverse. Must feather gas to get going.


Car has to idle at around 1,000 to 1,200 rpm to stay running. I checked timing, and it is now relatively close after realizing previous owner had the coil wires backwards, but can not get accurately tuned due to having higher rpms and cannot put in D, without stalling. When increased rpm's sounds great. I feel this is vacuum related and possibly bad power brake booster. I hope to have vacuum test run this weekend. Have any of you run into an issue like this before.


Note:
I have driven the car for a total of about 10-miles (2-3 miles at a time) around the block. In order to do this, I have to feather the gas pedal to get it in drive without stalling. then while driving, I have to have one foot on the brake and one on the gas at stop to keep rpms high enough not to stall. Seems a little weak on what the power should be but sounds really good running out. Car does not smoke. It has been a while since I have driven a car from this era, but the brakes do feel a little stiff from what they should be.


Thanks

Following this thread

Same thing is happening to my S4 13bt, although mine just suddenly started crapping out one morning.

Whenever the engine is in gear it dies? Yup same issue