Engine mounts
It could be a stuffed catalytic converter.
No a bad muffler shouldn't, but a clogged catalytic converter will.
yes ,gud chance it is blocked
Catalytic converter gone bad
A clogged converter will cause an extreme loss in power, poor mileage, and hard starting. If it is clogged really, really, bad it may cause the engine to not even start.
A partially clogged converter can get red hot. It could possibly start a fire.
Some symptoms of a bad catalytic converter on a 1994 Lumina are engine stalling, engine backfiring, no start of engine, and poor power pick up. If the catalytic converter has rust holes, the vehicle will also be very loud when running.
catalytic converter?
It could be your catalytic converter... yes, catalytic converters clog on these often. its fairly easy to unbolt it from the exhaust manifold. if you take it off, shine a flashlight up from the bottom, you should be able to see light from the top.
Start the engine. The water will evaporate from the heat generated by the engine.
Yes, if it just started in time you will lose power and speed, replace it, it is breaking up inside.
If the cat was totally blocked, the engine may start and run briefly for a few seconds. If the cat was partially blocked the engine would run but lack serious power.