Stalling Out

I just changed my Thermostat from Stant 195 degree to Stant 180 degree #45358. This change helped with my hot start issues a lot, but when I go to start the car cold it stalls out.

I have the thermostatic air cleaner hooked up, but I don't think it works at all.

When starting my car COLD, I pump the gas once, about midway to the floor, turn the engine over, it fires up, and then stalls out. I start the car again, this time pumping the gas to keep it alive so it wont stall out. Once my car warms up a little bit, it idles fine in park.

When I put my car in reverse to back out, it runs a little and then stalls out.

My 198 idles fine in park and neutral. But in Reverse and Drive from a COLD start, it can barely stay alive.

My idle is set at about 850 rpm in park and neutral. In reverse and drive, it is very low, how can I adjust idle when my car is in gear? Also, how can I go back to having my car pumped once and having the car able to not stall, when starting cold.

I know my Car runs way too lean, I know where the idle mixture screw is on my holley 1920, but which way do I turn it to richen the mixture and how much?

Thanks