BAD INJECTORS ON NEWER MODELS ????
will the transmission causes my 1999 ford expedition to bog down & sputter when accelerating the 4.6liter engine.
mass air flow sensor
Your Timing is not lined up properly and/or re-jet your carb.
Yes
A damaged catalytic converter could cause that.
if catalictic converter or any other part of the exhaust is clogged, it will cause engine to bog and die.exhaust needs to be clear to allow exhaust gases to escape
What car and engine? How is valve and ignition timing?, fuel pressure, etc?
White smoke from the exhaust is a sign of coolant entering the combustion chamber. Most likely cause is a blown head gasket. Stop driving this vehicle until you have this repaired or you will destroy this engine.
what would cause my car to run fine when it has first started up then after a while first gear will kinda bog down.
accleration is the speed. Velocity is when you know the speed of an object and its direction.
The engine may not be very good or too small and you may be giving it too much gas, thus flooding the engine. I'm not sure but this could be the problem.