Car starts ok then stops when you take your foot off the excellerator to back up or go forward.you have to keep your foot on excellorator untill engine warms up.before that if you have to stop at a stop sign the engine stops.

Two things come to mind,on your holley did you put fenalic spacer plate between the carb and the intake manifold? OK maybe i shouldn't have used the term fenalic but I mean a spacer or adapter plate between the carb and intake manifold. Any ways I've found that a lot of times the gaskets that goes under the adapter plate and the intake manifold leak and you will have a severe vacuum leak. There's a couple of easy ways to check. Just feel under the edge of the plate and see if you can feel a leak or you can use some starting fluid and with car running of course for this and the first test anyways with the car running spray around the carb and intake manifold and if the engine speeds up or just smoothes out then you have a leak. Or with the 650 cfm double pumper does it have a manual or electric choke. Because either way your choke may need to be adj

Auto idle module may be bad or the idle valve on the engine may need to be cleaned.

Most low idle speed problems on these engines are due to a faulty idle air control valve but since you state the idle will go up and return to idle then i would say it is working properly i think you have a throttle body coking problem ( dirt and grit accumulates around the butterfly valve in the throttlebody ) to fix this simply remove the fresh air hose from the throttlebody and open the throttle all the way up use a clen rag and wipe clean you may use a solvent such as B12 on the rag but dont use too much

It sounds to me like you have an air flow problem. That or a fuel flow problem. When was your last tune up performed and did the fuel filter get changed when tuned up? Your fuel pressure regulator could also need replacement

sounds like lock up solenoid in trans

idling jet carburette

sounds like the exhaust has restrictions. maybe the convertor is restricted or in the muffler.

The gearbox needs to pump oil to the tourque convertor to move the vehicle forward.I would suggest having the oil level and quality checked.Let the vehicle warm up a bit before pulling off.

Previous request answered.

This really sounds like you have a leaky head gasket or worse, a cracked water jacket. You may be getting coolant into your crankcase, which would "water down", so to speak, your oil and cause you to lose oil pressure. I do not know what you mean by your "oil registering fine". I presume you mean the level on the dipstick. Do you keep losing coolant? Is there any brown/white milky sludge under your oil cap or on your dipstick? If so, you most likey would have a head gasket leak.