What do you mean by Chug... like on highways does it kick back at a certain speed, if so it could be the TPS... a dead spark could be a bad headgaskets, wires, plugs, or coil... a clogging cat converter can even make it chug if its starting to clog, and if theres no air flowing threw the cat and exhaust the car can chug...
According to the Gates website , the 2.5 liter 4 cylinder engine in a 1993 Dodge Spirit is NOT an interference engine , so I would say NO
Over torqued, under torqued, age, abuse.
Vapor lock!
That would be very unlikely.
It is usually caused by either a bad tire, or loose steering components.
you are changing speeds
It could be a low charge. Try having the system checked for a leak.
The simplest way would be to use a grinder with a cutting disc and just cut the pipe off.
Yes, you need spark for the engine to run.
More info would be helpful such as year, make and model.
Other than the tank rusting thruogh, I would expect the leak to be from the hoses at the fuel pimp or the fuel pump seal.
You might want to test the ignition coil, battery, distributor (both type's can be tested), starter, starter relay or coil, and spark plugs to rule out which is causing the problem these are the basic components for starting the engine