69 Coronet R/T
New Member
So i need some help. I just bought the car and it has a 383 (440 was the original in 69') and the 727 TF trans. it is on jack stands now and idles approx ~850 RPM, dwell is 32-34, timing is ~15 TDC. It will shift into gear but then when brake is applied and it begins to slow the wheel rotation the engine RPM slows as well and stalls. Tried removing the brake booster vacuum line and plugging but same results. Most people seem to immediately guess vacuum leak, is this correct or could the trans not be slipping at lower RPMs? Any help is appreciated, thank you in advance! i feel like it is close but i am missing something easy or maybe not.