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Check all vacuum hoses, with engine running run propane gas next to each line to see if it dies or tries to stall. Get the computer checked, as it could be a torque converter issue. Also check the idle air control valve, air intake temp control. Clean out your intake very well, with the throttle body off. Take it from there, btw change your fuel filter and give it a complete tune up including the air filter. Keep me posted.
your muffler not only reduces sound but also tunes the flow of exhaust gas,so if it is missing, all the engine tune is put out completely,replace asap so that you run quiter and use less gas.(F1 racing cars have a length of pipe that is cut to an exact length to give max power...)
. Have it checked for a trouble code. It seems like a sensor problem. ( Idle position , crankshaft position, camshaft position sensors could be bad. Also the EGR valve could be bad. with a caode you can narrow it down a bit.
sounds like a fuel management problem. the catalytic converter is getting to hot due to tryin to burn off the excess fuel not burned. causing the muffler to overheat get it scaned at autozone for free. sounds like a o2 sensor runnin lean dumpin more fuel. or a bad mass airflow sensor good luck