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Have someone check the fuel pressure. Check EGR pod, you may have a Vacuum leak. Disconnect connector at a part called a TPS which is mounted on a Butterfly flap shaft opposite the throttle cable. Use an Ohmmeter on the TPS and check for smooth changes in Ohms as throttle is pressed. If you get to the warmed up engine running part, use a water spray bottle and spray the seams of the intake and any Vacuum lines or fixtures you see. If the engine stalls or sputters then you have found the leak.
check intake manifold air temp sensor and engine coolant sensor...one may be out of range but not enough to turn on dash light. tests and specs can be found in chiltons or haynes, test is done with digital multi-meter.
First thing that comes to mind is a clogged catalytic converter. Have someone rev while you put your hand next to the end of the tailpipe. Look inside for obstruction. It should be harder to not have your hand move as the engine races and it should sound clear and not muffled. Has this been coming on over a period of time or has it been sudden? Does it run OK for the first few seconds after starting for the day and then starts to die?