Looking for any solutions why the engine would stall when I put the transmission in gear. If you rev the engine you can slip it into drive. Also, when coming to a stop the engine stalls. It's a 1978 straight six 250 coupled with a turbo 400 transmission. It starts up and idles fine. No vaccuum lines attached other than the one from the transmission modulator to the intake. Dual points in distributor. It has a new Rochester monojet 1 barrel carb. By the way,its in a 1953 Chevy PU. I welcome all opinions.