Hoping someone out there can help me out. Just finished an LQ4/4l80e swap into an 85 Buick Regal. Had some dyno tuning done and car is running great at part throttle and wot. Problem is when I'm coming to a stop the car will drop below 500 rpms and sometimes(most times) stall.

Once I'm at a complete stop if it hasnt stalled it will jump right to 750rpm and idle fine considering the cam I'm running 600 lift 112 LSA.

Any idea's what could be causing the rpm drop when coasting?

Also car will start in any gear. seems like the 4l80e doesnt recognize the neutral/park safety position.

Thanks in advance.

 

Sounds like the idle tuning needs some work... if you paid for a full tune, take it back to the tuner and make them fix it.

Do you have a neutral/park safety switch hooked up on the shifter?